Charlotte Froese Fischer

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Charlotte Froese Fischer

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Why Is Charlotte Froese Fischer Influential?

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According to Wikipedia, Charlotte Froese Fischer is a Canadian-American applied mathematician and computer scientist noted for the development and implementation of the Multi-Configurational Hartree–Fock approach to atomic-structure calculations and its application to the description of atomic structure and spectra.

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Charlotte Froese Fischer's Published Works

Number of citations in a given year to any of this author's works

Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author

Published Works

GRASP92: a package for large-scale relativistic atomic structure calculations (1996) (562)
The grasp2K relativistic atomic structure package (2007) (472)
New version: Grasp2K relativistic atomic structure package (2013) (432)
Computational Atomic Structure: An MCHF Approach (1997) (355)
The Hartree-Fock method for atoms: A numerical approach (1977) (316)
Breit–Pauli energy levels, lifetimes, and transition probabilities for the beryllium-like to neon-like sequences☆ (2004) (258)
Average-energy-of-configuration Hartree-Fock results for the atoms helium to radon charlotte froese fischer (1972) (241)
General Hartree-Fock program (1987) (232)
NUMERICAL SOLUTION OF THE HARTREE–FOCK EQUATIONS (1963) (194)
Relativistic energy levels, lifetimes, and transition probabilities for the sodium-like to argon-like sequences (2006) (189)
GRASP2018 - A Fortran 95 version of the General Relativistic Atomic Structure Package (2019) (162)
A general multi-configuration Hartree-Fock program (1984) (137)
A Davidson program for finding a few selected extreme eigenpairs of a large, sparse, real, symmetric matrix (1994) (132)
A multi-configuration Hartree-Fock program (1984) (127)
An MCHF atomic-structure package for large-scale calculations (2007) (123)
A general program for computing angular integrals of the Breit-Pauli Hamiltonian (1991) (118)
A multi-configuration Hartree-Fock program with improved stability (1984) (114)
Hartree—Fock Parameters for the Atoms Helium to Radon (1966) (109)
Properties of Some Tridiagonal Matrices and Their Application to Boundary Value Problems (1969) (108)
The MCHF atomic-structure package (2000) (100)
Multiconfiguration Hartree-Fock results with Breit-Pauli corrections for forbidden transitions in the2p4configuration (1983) (100)
Average-energy-of-configuration Hartree-Fock results for the atoms helium to radon (1973) (90)
HFS92: A program for relativistic atomic hyperfine structure calculations (1996) (89)
The use of basis splines and non-orthogonal orbitals in R-matrix calculations: application to Li photoionization (2000) (88)
An efficient approach for spin - angular integrations in atomic structure calculations (1997) (87)
Breit-Pauli energy levels and transition rates for nitrogen-like and oxygen-like sequences (2002) (85)
Multiconfiguration Hartree-Fock Results with Breit-Pauli Corrections for Transitions in the Carbon Sequence (1985) (77)
Spline algorithms for continuum functions (1989) (71)
Oscillator strengths for 2S-2P transitions in the copper sequence (1977) (71)
Breit-Pauli energy levels, lifetimes, and transition data: beryllium-like spectra (1999) (70)
JJ2LSJ Transformation and Unique Labeling for Energy Levels (2017) (68)
RELCI: A program for relativistic configuration interaction calculations ? ? This program can be dow (2002) (68)
Z-dependence of correlation effects and f values in the sodium iso-electronic sequence (1976) (67)
Computational Atomic Structure (2019) (66)
JJGEN: A flexible program for generating lists of jj-coupled configuration state functions (2007) (63)
REOS99: A revised program for transition probability calculations including relativistic, correlation, and relaxation effects (2000) (60)
Hyperfine Induced Transitions as Diagnostics of Isotopic Composition and Densities of Low-Density Plasmas (1998) (58)
Spline methods for resonances in photoionisation cross sections (1990) (57)
Extension of the HF program to partially filled f-subshells (1996) (57)
Programs for computing LS and LSJ transitions from MCHF wave functions (1991) (56)
Theoretical Oscillator Strengths for nP → nD Transitions in Mg (1975) (55)
Some Hartree—Fock Results for Two‐ and Four‐Electron Atomic Systems (1967) (55)
Evaluating the accuracy of theoretical transition data (2009) (55)
MCHF-BP fine-structure splittings and transition rates for the ground configuration in the nitrogen sequence (1984) (54)
The self-consistent field with exchange for some 10 and 12 electron systems (1957) (54)
Non-relativistic variational calculations of atomic properties in Li-like ions: Li I to O VI (2001) (53)
Allowed transitions and intercombination lines in C III and C II (1994) (53)
Robust preconditioning of large, sparse, symmetric eigenvalue problems (1995) (53)
A program for performing angular integrations for transition operators (1991) (53)
Collapse of the 4f orbital for Xe-like ions (1983) (51)
A general program for computing angular integrals of the Breit-Pauli Hamiltonian with non-orthogonal orbitals (2000) (51)
Theoretical oscillator strengths for the resonance transitions in the Zn I isoelectronic sequence (1978) (51)
ACCURATE MULTICONFIGURATION DIRAC-FOCK CALCULATIONS OF TRANSITION PROBABILITIES IN THE MG ISOELECTRONIC SEQUENCE (1997) (51)
The solution of Schrödinger's equation for two-electron systems by an MCHF procedure (1973) (49)
Multiconfiguration Hartree-Fock Breit-Pauli results for 2P1/2-2P3/2 transitions in the boron sequence (1983) (48)
Lifetime trends for the n=3 singlet states in the Mg sequence☆ (1982) (47)
Convergence studies of MCHF calculations for Be and Li (1993) (47)
Systematic calculations of correlation in complex ions (1993) (47)
Energy levels, lifetimes, wavelengths, and transition probabilities of Fe XIV (1986) (44)
Energies and E1, M1, E2, M2 transition rates for states of the 2s22p, 2s2p2, and 2p3 configurations in boron-like ions between N III and Zn XXVI (2012) (43)
On the status and perspectives of MCDF calculations and measurements of transition data in the Be isoelectronic sequence (1998) (43)
Oscillator strengths for transitions to high-lying excited states of carbon (2002) (42)
Spline algorithms for the Hartree-Fock equation for the helium ground state (1990) (41)
Lifetimes of Low-Lying 2P0, 2D, and 2F0 States of the A1 I Isoelectronic Sequence (1981) (40)
Convergence studies of atomic properties from variational methods (1993) (40)
MCHF calculations of isotope shifts and oscillator strengths for transitions between low-lying states in Be-like systems and neutral magnesium (1999) (40)
Non-variational, spline-Galerkin calculations of resonance positions and widths, and photodetachment and photo-ionization cross sections for H- and He (1992) (39)
Relativistic CI calculations of spectroscopic data for the 2p6 and 2p53l configurations in Ne-like ions between Mg III and Kr XXVII (2014) (38)
Configuration maxing in the Al sequence (1968) (38)
Resonance transition energies and oscillator strengths in lutetium and lawrencium. (2002) (37)
Multiconfiguration Dirac-Hartree-Fock calculations of the forbidden transitions between 3s2 1S0,3s3p 3P0,1,2,1P1 states for Mg-like ions (2001) (36)
A B-spline Galerkin method for the Dirac equation (2008) (36)
Oscillator strengths for the 2P–2D transitions of the Al I sequence (1976) (36)
MULTICONFIGURATION DIRAC-FOCK CALCULATIONS OF THE 2S21S0-2S2P 3P1 INTERCOMBINATION TRANSITION IN C III (1998) (36)
BREIT–PAULI ENERGIES, TRANSITION PROBABILITIES, AND LIFETIMES FOR 2s, 2p, 3s, 3p, 3d, 4s2LLEVELS OF THE LITHIUM SEQUENCE,Z= 3–8 (1998) (35)
Systematic studies of N IV transitions of astrophysical importance (1995) (35)
Spline methods for multiconfiguration Hartree–Fock calculations (1992) (35)
Isotope shift in the sulfur electron affinity: Observation and theory (2010) (34)
Accurate oscillator strengths (1988) (34)
A general program for computing angular integrals of the non-relativistic Hamiltonian with non-orthogonal orbitals (1991) (34)
Breit-Pauli energy levels and transition rates for the carbonlike sequence (2001) (34)
Self-consistent-field (SCF) and multiconfiguration (MC) Hartree-Fock (HF) methods in atomic calculations: Numerical integration approaches (1986) (33)
Discrepancies between theoretical and experimental atomic oscillator strengths of the sodium isoelectronic sequence resonance transition (1976) (33)
A program for computing magnetic dipole and electric quadrupole hyperfine constants from MCHF wavefunctions (1993) (33)
Multiconfiguration Dirac-Hartree-Fock Calculations with Spectroscopic Accuracy: Applications to Astrophysics (2017) (33)
REDUCED COEFFICIENTS (SUBCOEFFICIENTS) OF FRACTIONAL PARENTAGE FORp-,d-, ANDf-SHELLS (1998) (32)
REOS — A program for relaxed-orbital oscillator strength calculations (1997) (31)
The differential analyzer (2003) (30)
Core-polarization effects in the Cadmium isoelectronic sequence (2000) (30)
Hartree-Fock Procedure for Some nsn's 1 S Configurations (1966) (30)
DBSR_HF: A B-spline Dirac-Hartree-Fock program (2016) (29)
Calculations with spectroscopic accuracy: Energies, transition rates,and Lande gJ-factors in the carbon isoelectronic sequence from Ar XIII to Zn XXV (2014) (29)
Atomic structure calculations using MCHF and BSR (2009) (28)
CALCULATED LEVEL ENERGIES, TRANSITION PROBABILITIES, AND LIFETIMES FOR PHOSPHORUS-LIKE IONS OF THE IRON GROUP IN THE 3s3p4AND 3s23p23dCONFIGURATIONS☆ (1998) (28)
The Effect of Configuration Interaction on the Transition Integral. (1965) (27)
Accurate spline solutions of the radial Dirac equation (1993) (27)
MCHF CALCULATIONS FOR ATOMIC PROPERTIES (1994) (27)
Comparison of multichannel-quantum-defect theory and multiconfiguration-Hartree-Fock wave-functions for alkaline-earth atoms (1981) (27)
Short-range interactions involving plunging configurations of the n = 3 singlet complex in the Mg sequence (1982) (26)
Landé g factors for 2p4 (3P)3p and 2p4(3P)3d states of Ne II (2001) (26)
Photon Emission from Core-Excited Be I and Be II States (1983) (25)
Energies and E1, M1, E2, and M2 transition rates for states of the 2s{sup 2}2p{sup 3}, 2s2p{sup 4}, and 2p{sup 5} configurations in nitrogen-like ions between F III and Kr XXX (2014) (24)
Core polarization in Ca I and Ca II (1993) (24)
Numerical solution of general Hartree-Fock equations for atoms (1978) (24)
Complete Active Space multiconfiguration Dirac-Hartree-Fock calculations of hyperfine structure constants (2009) (24)
SUPERPOSITION OF CONFIGURATION RESULTS FOR Si II. (1968) (24)
Effects of electron correlation, relativity, and nuclear structure on hyperfine constants of Be{sup +} and F{sup 6+} (1999) (23)
A partitioned correlation function interaction approach for describing electron correlation in atoms (2013) (23)
MCHF evaluation of the specific mass shift (1983) (23)
Regular Article: Integration by Cell Algorithm for Slater Integrals in a Spline Basis (1999) (23)
Evaluation and Comparison of the Configuration Interaction Calculations for Complex Atoms (2014) (23)
LETTER TO THE EDITOR: Lifetime and hyperfine structure of the 3D2 state of radium (2004) (23)
Transition rates for some forbidden lines in Fe IV (1998) (22)
Accurate Multiconfiguration Hartree-fock Calculations of Oscillator-strengths In Light-atoms - the Boron (b-ii) Line At 1362 Angstrom (1995) (22)
Some improved transition probabilities for neutral carbon (2006) (22)
Accurate calculations of transition probabilities, isotope shifts and hyperfine structures for some allowed ? - ? transitions in B I, C II and C I (1996) (22)
MCHF calculations for 1S and 1P Rydberg states in Ca I (1985) (22)
Atomic Structure Variational Calculations in Spectroscopy (1998) (22)
Large-scale MCHF calculations of hyperfine structures in nitrogen and oxygen (1997) (21)
MCHF atomic-structure package: support libraries and utilities (1991) (21)
Systematic transition probability studies for neutral nitrogen (1994) (21)
Numerical Hartree–Fock results for the atoms helium to radon (1968) (21)
Energy levels and lifetimes for some quartet states of Be II (1982) (21)
Photodetachment cross section of He − ( 1 s 2 s 2 p 4 P o ) in the region of the 1 s detachment threshold (1999) (21)
Exploring biorthonormal transformations of pair-correlation functions in atomic structure variational calculations (2009) (21)
Transition Probabilities for the UV0.01 Multiplet in N III (1995) (20)
Brillouin's theorem for excited (nl)q(n'l)q' configurations (1973) (20)
Isotope shift in the oxygen electron affinity (1999) (20)
MCDHF and RCI calculations of energy levels, lifetimes and transition rates for 3l3l ', 3l4l ', and 3s5l states in Ca IX - As XXII and Kr XXV (2017) (20)
A configuration interaction program (1991) (20)
Correlation effects important for accurate oscillator strengths (1974) (20)
The 4s2S–4p2P transition of the Al sequence (1978) (20)
A B-spline Hartree-Fock program (2011) (19)
Atomic Structure: Multiconfiguration Hartree-Fock Theories (2006) (19)
Towards accurate transition data for 3p2, 3p3, 3p4 levels of Fe, Co and Ni ions (2010) (19)
Photodetachment of He− 1s2s2p 4Po in the region of the 1s threshold (2002) (19)
Douglas Rayner Hartree : His life in science and computing (2003) (19)
Some Multiplet Strengths for Transitions in fe XVI and fe XV. (1964) (19)
Multiconfiguration Hartree-Fock calculations atomic properties for light atoms (1996) (19)
Multi-Configuration Hartree–Fock Correlation Study of 1s2s1S (1973) (19)
Multi-configuration Hartree-Fock calculations and time-resolved laser spectroscopy studies of hyperfine structure constants in sodium (1992) (18)
A COMPARISON OF SPIN-ORBIT PARAMETERS (1967) (18)
Oscillator-strength trends in the presence of level crossings (1980) (18)
Multiconfiguration Dirac–Hartree–Fock energy levels and transition probabilities for 3d5 in Fe iv (2008) (18)
Oscillator strengths for some D -F transitions in the Mg sequence (1979) (18)
Comment on "Theoretical Confirmation of the Low Experimental 3C/3D f-Value Ratio in Fe xvii". (2017) (18)
THE ORTHOGONALITY ASSUMPTION IN THE HARTREE–FOCK APPROXIMATION (1967) (18)
Ab initio calculations for intercombination and resonance lines in P II (1993) (18)
Non-orthogonal orbitals in MCHF or configuration interaction wave functions (1988) (17)
Energy levels and transition rates for the boron isoelectronic sequence: Si X, Ti XVIII - Cu XXV , (2013) (17)
Reflection of a transient electromagnetic wave at a conducting surface (1955) (17)
Measurements and predictions of the 6s6p 1,3 P 1 lifetimes in the Hg isoelectronic sequence (2001) (17)
Allowed transitions and intercombination lines in B II (1995) (17)
Hartree-Fock Results for Some Excited States of O +2 , O + , and Ne + (1965) (17)
Breit–Pauli and Dirac–Hartree–Fock energy levels and transition probabilities in neutral argon (2004) (17)
Multiconfiguration Dirac-Hartree-Fock energy levels and transition probabilities for W xxxviii (2012) (16)
Low-lying /sup 1/D states of Be I (1984) (16)
The Effect of Correlation in the 3dn Core on the Resonance Transition in Cu II (1980) (16)
Spline–Galerkin calculations for Rydberg series of calcium (1994) (16)
A program to generate configuration-state lists (1991) (16)
Note on the 2s2 1S0-2s2p 3P1 intercombination line of B II and C III (1997) (16)
Accurate Calculation of the Isotope Shift and Hyperfine Structure in the Boron (B ii) Line at 1362 Angstrom (1994) (16)
Relativistic and Correlation Effects on the Lifetimes of 3s4p 3PJo Levels in Mg-like Sulphur and Chlorine (1985) (16)
Core Effects on Transition Energies for 3dk Conﬁgurations in Tungsten Ions (2017) (16)
Laser transition probabilities in Xe I (2006) (15)
Reducing synchronization on the parallel Davidson method for the large, sparse, eigenvalue problem (1993) (15)
Systematic studies of the - transition in the Be-like sequence (1997) (15)
B-splines in variational atomic structure calculations (2008) (15)
Nuclear quadrupole moment of scandium (1997) (15)
Iterative solution of the Hartree-Fock equations with improved stability (1972) (15)
Ab initio MCDHF calculations of electron–nucleus interactions (2015) (15)
Core polarization effects on oscillator strengths in neutral zinc (1992) (15)
Transition probabilities in O III (1994) (15)
MCHF+BP results for electric dipole transitions in the oxygen isoelectronic sequence (1984) (14)
The 2p-3s transitions in atomic oxygen (1987) (14)
Accurate multiconfiguration calculations of energy levels, lifetimes, and transition rates for the silicon isoelectronic sequence - Ti IX – Ge XIX, Sr XXV, Zr XXVII, Mo XXIX (2016) (14)
Experimental and theoretical investigation of radiative lifetimes in neutral gallium (1986) (14)
Breit and QED effects on the 3d9D3/22→2D5/2 transition energy in Co-like ions (2018) (14)
Allowed and spin-forbidden electric dipole transitions in Ca I (2003) (14)
Oscillator strength calculations in neutral technetium (2005) (14)
LARGE-SCALE MULTICONFIGURATIONAL DIRAC-FOCK CALCULATIONS OF THE HYPERFINE-STRUCTURE CONSTANTS AND DETERMINATION OF THE NUCLEAR QUADRUPOLE MOMENT OF 49 TI (1999) (14)
Combining Multiconfiguration and Perturbation Methods: Perturbative Estimates of Core–Core Electron Correlation Contributions to Excitation Energies in Mg-Like Iron (2017) (14)
MULTICONFIGURATION DIRAC-FOCK CALCULATIONS OF THE HYPERFINE STRUCTURE CONSTANTS AND DETERMINATION OF THE NUCLEAR QUADRUPOLE MOMENT OF YTTRIUM 90 (1998) (14)
Accurate multiconfiguration Hartree-Fock calculations of isotope shifts in C I and C IV (1995) (14)
Multiconfiguration Dirac-Hartree-Fock optimization strategies for 3 s 2 1 S 0 − 3 s 3 p 3 P 1 transition rates for Al + − S 4 + (2000) (14)
Comment on the magnetic dipole hyperfine interaction in the gold atom ground state (2008) (14)
Excited states of the negative nitrogen ion: Energies and Lifetimes (1997) (14)
A Pvm Implementation of the Mchf Atomic Structure Package (1996) (13)
Transition energies and transition rates for the 2p4(3P)3p - 2p4(3P)3d transitions in Ne II (1999) (13)
Oscillator strengths for 3dn4s → 3dn4p transitions in the iron series (1973) (13)
Ab initio results for V I and Cr I (1976) (13)
Numerical multiconfiguration Hartree-Fock calculations for nsnp3P states of Rb and Cs negative ions (1989) (13)
Concurrent Vector Algorithms for Spline Solutions of the Helium Pair Equation (1991) (13)
Breit–Pauli Oscillator Strengths, Lifetimes and Einstein A Coefficients in Singly Ionized Sulphur (2005) (12)
Energies and E1, M1, E2, and M2 transition rates for states of the 2s22p4, 2s2p5, and 2p6 configurations in oxygen-like ions between F II and Kr XXIX (2013) (12)
The - resonance line in neutral beryllium (1996) (12)
A new version of AAKF (Reduced Tensor Matrix Elements) adapted to spectroscopic notation (1975) (12)
A program to compute isotope shifts in atomic spectra (1993) (12)
Breit–Pauli energy levels, transition probabilities and lifetimes for 3d5 levels in Fe iv of astrophysical interest (2004) (12)
Hartree-Fock Calculations for Atoms with Inner-Shell Vacancies (1977) (12)
Photoionization of magnesium (1987) (12)
LSGEN - a program to generate configuration-state lists of LS-coupled basis functions (1993) (12)
Electron affinities of At and its homologous elements Cl, Br, and I (2018) (12)
Predictive data-based exposition of 5s5p{sup 1,3}P{sub 1} lifetimes in the Cd isoelectronic sequence (2000) (11)
Doublet-quartet energy separation in boron: A partitioned-correlation-function-interaction method (2013) (11)
MCHF calculations of autoionization widths in two- and three-electron systems (1993) (11)
Measurement of the Kr XVIII 3d 2D5/2 lifetime in a unitary Penning Trap (2014) (11)
Correlation study of Be 1 s 2 2 s 2 p P 1 by a separated-pair numerical multiconfiguration Hartree-Fock procedure (1974) (11)
Lifetimes of 4 p 5 4 d levels in highly ionized atoms (2015) (11)
4 s 4 d D 1 − 4 p 2 D 1 interaction in the Zn I isoelectronic sequence (1979) (10)
Superposition of configuration results for oxygen (1967) (10)
Some Hartree–Fock Results for (3d + 4s)q+1 Configurations (1971) (10)
The Mg+ 3s 2S1/2-4p 2Po3/2,1/2 weak transition probabilities revisited (1999) (10)
Multi-configuration Hartree-Fock plus Breit-Pauli results for some forbidden transitions (1986) (10)
Hyperfine-structure calculations of excited levels in neutral scandium (2002) (10)
The deffered difference correction for the Numerov method (1971) (10)
Nuclear magnetic shielding constants calculated from numerical hartree‐fock wave functions (2009) (10)
Note on MCDF correlation calculations for high-Z ions (1994) (10)
Correlation and Relativistic Effects on Transitions in Lighter Atoms (1999) (10)
Spin-other-orbit Operator in the Tensorial Form of Second Quantization (1998) (9)
The orthogonality assumption in the Hartree–Fock approximation for 2pn3p configurations (1968) (9)
Optical quenching of metastable magnesium (2007) (9)
Correlation effects on transition probabilities in Mo vi (2011) (9)
A correlation study of Li ground state by the MCHF procedure (1975) (9)
Correlation in negative ions (1989) (8)
Autodetachment of the nsnp2 4P1/2 states in negative ions (1992) (8)
Breit-Pauli lifetimes and transition probabilities for Si I (7 pages) (2005) (8)
Contributions to the electron affinity of calcium and scandium (1992) (8)
Multitasking the Davidson Algorithm for the Large, Sparse Eigenvalue Problem (1989) (8)
Gƒ-VALUES for Lines of the SI II Spectrum (1966) (8)
LIMITING SCREENING NUMBERS AND ENERGY PARAMETERS (1963) (7)
Multiconfiguration Hartree-Fock calculations of the oscillator strength for the 2s2p /sup 1/P/sup 0/. -->. 2p/sup 2/,2snd /sup 1/D (n = 3--6) transitions in beryllium (1987) (7)
ANALYSIS OF BREIT–PAULI TRANSITION PROBABILITIES FOR LINES IN O iii (2009) (7)
PROGRAMS FOR ATOMIC-STRUCTURE CALCULATIONS. (1968) (7)
A critical review of programs in atomic structure for bound states (1973) (7)
Correlation and the 5F–3F energy separation in Ti (1982) (7)
Oscillator Strengths for the 3s^{2}3p ^{2}P-3s3p^{2} ^{2}S Transition in AL I. (1965) (7)
A Programming Language, by Kenneth E. Iverson. John Wiley and Sons, Inc., 1962. (1964) (7)
4p2 resonances in photoionization from 4s4p levels in neutral zinc (2007) (7)
Radiative lifetime of a bound excited state of Te-. (2004) (7)
Asymptotic Behaviour Of The Inverse Of a Laplace Transform (1955) (6)
Oscillator strengths from numerical MCHF radial functions (1984) (6)
Core-excited quintet states in Mg I (1991) (6)
LETTER TO THE EDITOR: Magnetic-dipole transitions between the lowest 3d4 J = 2-3 transitions in highly charged titanium-like ions (2001) (6)
Numerical Procedures for Relativistic Atomic Structure Calculations (2020) (6)
Hypercube conversion of serial codes for atomic structure calculations (1992) (6)
A distributed-memory implementation of the MCHF atomic structure package (1994) (6)
Exact evaluation of slater integrals using ALTRAN, a symbol manipulation language (1973) (6)
Cross section and angular distribution for the photodetachment of (12s2P) (1999) (6)
Some corrections to GRASP92 (2006) (6)
Correlation Effects and f-Values in the Sodium Sequence (1976) (6)
Multiconfiguration Dirac–Hartree–Fock Calculations for Be-like Intercombination Lines Revisited (2000) (6)
Reminiscences at the end of the Century (2000) (6)
A comparison of multi-configuration Hartree-Fock and configuration interaction results for the 1D series of Mg (1970) (6)
The Landé g-factor in atomic spectroscopy (2004) (6)
Hartree-Fock Parameters for the 2p^{2} C i Sequence (1966) (6)
The limiting behaviour of atomic wave functions for large atomic number (1957) (6)
Multitasking the calculation of angular integrals on the CRAY-2 and CRAY X-MP (1988) (5)
Theoretical Energy Levels of 3F0 Rydberg Series for Mg I, Al II, and Si III (1980) (5)
The - intercombination line in the Be-like sequence (1997) (5)
The effect of electron correlation on the charge density at the iron nucleus (1976) (5)
The limiting behaviour of atomic wave functions for large atomic number. II (1958) (5)
The electron affinity of in boron (1996) (5)
Term dependence of Hartree-Fock results for some nln'l configurations (1972) (5)
Relativistic all-order and multiconfiguration Hartree-Fock calculations of the 4d-4f energy separation in Li I (2007) (5)
SOME TWO-ELECTRON PROPERTIES OF SODIUM (1998) (5)
Natural orbitals in multiconfiguration calculations of hyperfine-structure parameters (2020) (5)
Transition probability of the 1S0 → 1D2 emission of atomic oxygen (1982) (5)
ANGULAR INTEGRATION USING SYMBOLIC STATE EXPANSIONS (2004) (4)
CALCULATED DIFFRACTION PATTERNS OF DIELECTRIC RODS AT CENTIMETRIC WAVELENGTHS (1954) (4)
A program for computing autoionization properties (1993) (4)
Lifetimes of some2s22p 2P3/2states from variational theory (2016) (4)
An Mpi Implementation of the Mchf Atomic Structure Package (1996) (4)
On Solving y" - fy + g with a Boundary Condition at Infinity (1962) (4)
Electron correlation in the lanthanides:4f2spectrum ofCe2+ (2019) (4)
Perturbers in the (2D)nd 3Po Rydberg series of sulphur (1987) (4)
The Effect of Correlation on Spectra of the Lanthanides: Pr3+ (2018) (4)
On solving ^{”}=+ with a boundary condition at infinity (1962) (4)
Lifetime of 2s2p23s3P in N II and other allowed triplet transitions (1994) (4)
Douglas Rayner Hartree (2003) (3)
Z-Dependent Comparison of the Unrestricted and Conventional Hartree-Fock Approximation (1965) (3)
A Z-Dependent Representation of the Transition Integral (1976) (3)
Relativistic calculations for highly charged ions (2005) (3)
Autoionization rates for core excited 5P states in Na (1989) (3)
Non-variational Multiconfiguration Hartree-Fock Calculations for Continuum Wave Functions (1993) (3)
Wave functions for the normal states of Ne+3 and Ne+4 (1957) (3)
The Self-Consistent Field with Exchange for the Ground State and First Excited State of Fe+13 (1957) (3)
An Introduction to Relativistic Theory as Implemented in GRASP (2022) (3)
Multiconfiguration Dirac-Hartree-Fock energies and transition probabilities for transitions in Ne II (2008) (3)
Approximate solution of schrödinger's equation for atoms (1982) (3)
Iodine complexes in inert solvents: Part XIII. The system: Iodine-benzene-CCl4 (1962) (3)
Toward Calculations with Spectroscopic Accuracy: the 2s2.2p 2Po_{3/2} - 2s2p2 4P_{5/2} Excitation Energy in Boron (2013) (2)
Fine-structure splitting of some high-L, Rydberg states of helium (1989) (2)
Mixed-valence state treatment for X-ray emission spectra of cuprate superconductors (1994) (2)
MCHF calculations of hyperfine-induced transitions in the Breit-Pauli approximation (1995) (2)
Overlapping domain decomposition preconditioners for the generalized Davidson method for the eigenvalue problem (1994) (2)
Re-Evaluation of the Nuclear Magnetic Octupole Moment of 209Bi (2022) (2)
An Evaluation of Runge-Kutta Type Methods for Higher Order Differential Equations (1961) (2)
RELATIVISTIC AND NON-RELATIVISTIC SCF WAVE FUNCTIONS FOR ATOMS AND IONS FROM Z = 2 TO 80, TOGETHER WITH CALCULATIONS OF BINDING ENERGIES, MEAN RADII, SCREENING CONSTANTS, CHARGE DISTRIBUTIONS, AND ELECTRON SHAKE-OFF PROBABILITIES. (1966) (2)
GRASP Manual for Users (2023) (2)
Splines in atomic structure calculations (1995) (2)
Towards B-Spline Atomic Structure Calculations (2021) (2)
A note on estimating the 1s3d 1D exact, non-relativistic total energy for helium (1982) (2)
ON THE CALCULATION OF THE VELOCITY OF SOUND IN SEA WATER (1959) (1)
On the use of RAS configuration interaction expansions to deal with non-orthogonalities in transition probability calculations (1994) (1)
Relativistic Variational Calculations for Complex Atoms (2009) (1)
Variational Methods for Atoms and the Virial Theorem (2022) (1)
Variational calculations of correlated wavefunctions and energies for ground, low-lying as well as highly excited discrete states in many-electron atoms using a new atomic structure theory including electron correlation (2016) (1)
Limiting behaviour of atomic wave functions for large atomic number. IlI (1959) (1)
Levels of 2p53p5 in Ar2 (1978) (1)
The 2p4 3P1,2-2p33s 5S20 and 2p4 3P1,2-2s2p5 3P20 transitions in the oxygen isoelectronic sequence (1998) (1)
Accurate calculations of isotope shifts and hyperfine structures in light atoms (1995) (1)
Critical evaluation of Breit and QED effects on the 3 d 9 2 D 3 / 2 → 2 D 5 / 2 transition energy in Co-like ions (2019) (1)
Large-scale MCHF calculations of isotope shifts and hyperfine structures in light atoms (1995) (1)
Interpretation by orthogonal operators of Hartree–Fock analyses for Fe vi 3d 2 4p (1988) (1)
Systematic studies of isotope shifts in light atoms by active set MCHF calculations (1994) (1)
Theoretical Transition Probabilities and Lifetimes (2005) (1)
The and transitions in the oxygen isoelectronic sequence (1998) (1)
The 2s 2 1 S–2s2p 1 P o resonance line in neutral beryllium (1996) (1)
Accurate f-values for N I and astrophysical implications (1990) (1)
Robust Preconditioning of Large , Sparse , Symmetric Eigenvalue (1994) (1)
The effect of correlation on the excitation probability Kr 4p6→Rb+ 4p5 5p following β-decay (1974) (1)
Systematic calculations transitions in N IV (1995) (1)
Hartree-Fock Calculations (2019) (1)
Accurate MCHF Calculations of Atomic Properties of Light Atoms (1995) (1)
Multiconfiguration Hartree--Fock method for atomic energy levels and transition probabilities (1978) (1)
Lifetimes of some 2 s 22 p 2 P 3 / 2 states from variational theory (2016) (1)
G-factor measurements of picosecond states: opportunities and limitations of the recoil-in-vacuum method (2008) (1)
Diamagnetic susceptibilities calculated from numerical hartree‐fock wave functions (2009) (1)
MCHF calculations of isotope shifts; I program implementation and test runs II large-scale active space calculations (1994) (1)
Energy levels and gf-values for Fe XIV (1978) (1)
Multiconfiguration Hartree-Fock Calculations for Complex Atoms (1984) (0)
VizieR Online Data Catalog: Silicon isoelectronic sequence data (Jonsson+, 2016) (2015) (0)
VizieR Online Data Catalog: Mg-like ions energy levels (Gustafsson+, 2017) (2016) (0)
Large scale systematic calculations of transition probability for neutral nitrogen (1993) (0)
Interaction of Variational Localized Correlation Functions for Atomic Properties (2011) (0)
On the use of the Natural Orbitals to compute the hyperfine structure of neutral sodium (2019) (0)
Professor at the University of Manchester (2003) (0)
Configuration interaction with separately optimized pair correlation functions (2010) (0)
Early research at Cambridge University (2003) (0)
The Partitioned Correlation Function Interaction approach applied to B I, C II and more complex systems (2013) (0)
Some MCHF results for Rydberg States (1979) (0)
A Davidson Program for Nding a Few Selected Extreme Eigenpairs of a Large, Sparse, Real, Symmetric Matrix Program Summary (2007) (0)
Lifetime trends for the n=3 singlet levels of the magnesium sequence (1981) (0)
Matrix Element Expansions for Atomic Structure (1998) (0)
VizieR Online Data Catalog: Oxygen-like ions Energies and transition rates (Rynkun+, 2013) (2013) (0)
Correlation in Many-Electron Systems (2019) (0)
Photodetachment of He(sup -)1s2s2p(sup 4)P(sup 0) in the Region of the 1s Threshold (2002) (0)
Large-scale MCHF Calculation of the Li I 4d-4f Energy Separation | NIST (2007) (0)
Multiconfiguration Hartree–Fock Wave Functions (2022) (0)
Accurate transition probabilities for light atoms (1995) (0)
Summers in North America (2003) (0)
Computer simulation for the optimization of transponders (1983) (0)
Large-scale MCHF calculations for the resonance transition of Na: Hyperfine constants and transition rates (1995) (0)
Isotope shift in the electron affinity of sulfur: Observation and theory (2008) (0)
Introduction to the Laplace Transform (Dio L. Holl and Clair G. Maple) (1960) (0)
Interaction of Variational Localised Correlation Functions for Atomic Properties of Be I (2012) (0)
Description of the Be ground state based on the interaction of separately optimized pair correlation functions (2009) (0)
MCHF and MCHF+BP atomic properties of lithium-like ions (1998) (0)
Relativistic variational methods and the Virial Theorem (2021) (0)
Hartree–Fock Calculations (2022) (0)
The lifetime of 4p54d levels in highly ionized atoms | NIST (2016) (0)
Determination of atomic data pertinent to the Fusion Energy Science Program (2014) (0)
Computational atomic structure with GRASP towards heavy atoms and ions of astrophysical interest (2019) (0)
Variational Pair-Correlation Functions for Automic Properties (2010) (0)
Atomic Structure Calculations: Encapsulating knowledge in computer codes: LabTalk series Article 47035 (2011) (0)
MCHF Continuum Wave Functions (2019) (0)
Multiconfiguration Hartree-Fock Wave Functions (2019) (0)
Dawn of the computer era (2003) (0)
Transition Rates for 3s3p2 4P–3s3p4s 4Po Transitions in Al i (2019) (0)
Revisited relativistic Dirac-Hartree-Fock X-ray scattering factors. I. Neutral atoms with Z = 2-118. (2023) (0)
Excitation energy of 5d ^2D_3/2 - 6p ^2P_1/2 of atomic Lu by the multiconfiguration Dirac-Hartree-Fock method (2001) (0)
Evaluating the accuracy of theoretical transition data (2009) (0)
Revisited relativistic Dirac-Hartree-Fock X-ray scattering factors. II. Chemically relevant cations and selected monovalent anions for atoms with Z = 3-112. (2023) (0)
Systematic studies of the 2s² 1So - 2s3p1,3Po1 transitions in the Be-like sequence (1996) (0)
On the energy difference between 1s22s22p 2Po and 1s22s2p2 4P terms in Boron (2012) (0)
The effect of correlation on the excitation probability Kr 4 p 6 ?Rb + 4 (1974) (0)
Arrangements for war (2003) (0)
An extension of the multiconfiguration Hartree-Fock program for continuum functions (1984) (0)
Control theory and industrial applications (2003) (0)
The Sulfur electron affinity: A good test case for theoretical isotope shift calculations (2007) (0)
St. Louis University. (1988) (0)
Calculations of transition probabilities in the Z sequence (1979) (0)
Production of atomic data using relativistic multiconfiguration methods (2010) (0)
Many-body and relativistic effects in the beryllium sequence (1981) (0)
Education, World War I, and marriage (2003) (0)
Large-scale MCHF calculations of isotope shifts in light atoms (1995) (0)
Electric field gradients and quadrupole coupling constants calculated from numerical hartree-fock wave functions (2009) (0)
A Course in Algol Programming, by G. F. Schaefler. MacMillan, Toronto, 1966. ix + 201 pages. (1967) (0)
Initial Estimates for Self-Consistent Field Calculations for Atoms with Large Atomic Number (1959) (0)
Charlotte Froese Fischer: List of Publications (2000) (0)
Fermi contact interaction constants calculated from numerical hartree‐fock wave functions (2009) (0)
B-splines in variational atomic structure theory (2007) (0)
Oscillator strengths for highly ionized atomic systems. Final report, May 1, 1977-December 31, 1979 (1979) (0)
Theoretical Energy Levels of F Rydberg Series for Mg I, AI II, and Sill1 (1980) (0)
Returning to Cambridge (2003) (0)
A multiconfiguration hartree-fock approach to atomic structure calculations (2009) (0)
Lifetimes of some 2s22p 2P3=2 states from variational theory | NIST (2016) (0)
Evaluation of Breit and QED effects on the $3d^9\ ^2D_{3/2}\rightarrow 3d^9\ ^2D_{5/2}$ transition energy using different approximations (2018) (0)
The Computational Atomic Structure Group – Code Development and Available Resources (2014) (0)
Introduction to programming the IBM 1620 (1964) (0)
Orthogonality considerations in the computation of autoionization widths (1992) (0)
ACCURATE MCHF/MCDF TRANSITION RATES (1998) (0)
The ATSP2K and GRASP2K Multiconfiguration Atomic Structure Program Packages (2013) (0)
Radio waves in the atmosphere (2003) (0)
MCHF calculations of isotope shifts in calcium (1992) (0)
Computational atomic structure developments with GRASP towards heavy atoms and ions of astrophysical interest (2019) (0)
The final years (2003) (0)
Study of Gadolinium ionization energy (1999) (0)
MCDF calculations of transition rates of astrophysical interest in neutral Technetium (1999) (0)
Atomic and Molecular Properties from Astronomers' Sky Spectra (2003) (0)
Accurate MCHF oscillator strengths in B and B (1994) (0)
Exact maps in density functional theory for lattice models (2016) (0)
Non-orthogonalities in transition matrices: No problem (1994) (0)
The effect of correlation on line strengths in third row elements (2005) (0)
Laminar boundary layer theory (2003) (0)
General multi-configuration Hartree--Fock program: MCHF77. [In FORTRAN (double precision) for IBM 360 and 370] (1977) (0)
Theoretical study of hyperfine structure of ground state in neutral Carbon (2015) (0)
Accurate MCHF calculations of the oscillator strength and hyperfine structures in the sodium resonance transition (1995) (0)
Theoretical Studies of Atomic Transitions (2005) (0)
Theoretical atomic properties for light atoms (1998) (0)
MCHF calculations for 2s² 1S - 2s3p 1Po transitions in some Be-like systems (1995) (0)
------------------------------------------------------------- - (2009) (0)
Massive Calculations of Atomic Properties with High Accuracy for Boron-like Iron and other Ions of Astrophysical Interest (2013) (0)
Theoretical energy levels of /sup 3/F/sup 0/ Rydberg series for Mg I, Al II, and Si III. [Multiconfiguration Hartree-Fock] (1979) (0)
Configuration interaction in the spin‐polarized hartree–fock approximation (2009) (0)
Design of a database for atoms (1985) (0)
Advances in atomic theory (2003) (0)
Introduction (2022) (0)
Lifetimes of Low-Lying P , D, and F States of the AI I Isoelectronic Sequence (1981) (0)
Theoretical studies of atomic transitions. Renewal progress report, April 1, 1994--March 31, 1997 (1996) (0)
Variational Pair-Correlation Functions for Atomic Properties (Cairns) (2010) (0)
Transition probability of the /sup 1/S/sub 0/. -->. /sup 1/D/sub 2/ emission of atomic oxygen (1982) (0)
Oscillator strengths for the weak 3s ²S - 4p ²Po transition in Mg II (1998) (0)
MCHF-BP fine-structure splittings and transition probabilities in the ground configuration of nitrogen sequence (1983) (0)
Hyperfine Quenching of the 1s²2s2p ³Po0 in C III and N IV and their astrophysical interest (1995) (0)
A new program package for atomic structure calculations (1982) (0)
Relativistic Effects (2019) (0)
The new quantum mechanics (2003) (0)
Allowed and Forbidden Transitions (2019) (0)
A Partitioned Correlation Function Approach for Atomic Properties (Washington) (2012) (0)
O ct 2 01 3 Toward calculations with spectroscopic accuracy : the 2 s 2 2 p (2013) (0)
Many-body and relativistic effects in the Be sequence (1981) (0)
Theoretical studies of atomic transitions. Progress report, March 15, 1986-March 14, 1987 (1987) (0)
Effect of correlation in the 3d/sup n/ core on the resonance transition in Cu II. [Multiconfiguration Hartree-Fock] (1979) (0)
Spline-Galerkin calculations of Rydberg series and photoionization (1993) (0)
A trip to Australia (2003) (0)
Accurate calculations of isotope shifts in light atoms (1996) (0)
The Hartree family (2003) (0)
VizieR Online Data Catalog: Carbon isoelectronic sequence data (Ekman+, 2014) (2014) (0)
Parametric analysis and ab initio calculations of isotope shifts in neutral and singly-ionized nickel (2001) (0)
Effect of correlation on the excitation probability Kr 4p$sup 6$ $Yields$ Rb$sup +$ 4p$sup 5$5p following $beta$-decay (1974) (0)
Configuration State Functions and Matrix Elements of the Hamiltonian (2019) (0)
Atomic structure research using EDSAC (2003) (0)
Physica Scripta . Vol . T 78 , 33 È 46 , 1998 Atomic Structure Variational Calculations in Spectroscopy (1999) (0)
Ab initio calculations of the Sulfur electron-affinity in the MCHF approach (2007) (0)
Atomic Structure Calculations with Spectroscopic Accuracy – Implications for Laboratory Work (2014) (0)
A Partitioned Correlation Function approach for atomic properties (Göteborg) (2012) (0)
Transition Rates for 3 s 3 p 2 4 P − 3 s 3 p 4 s 4 P o Transitions in Al I (2019) (0)
Oscillator strengths for highly ionized atomic systems. Progress report, May 1, 1977--April 30, 1978. [Summaries of research activities at Pennsylvania State Univ] (1978) (0)
Oscillator strengths for highly ionized atomic systems. [Summaries of research activities at Pennsylvania State Univ] (1979) (0)
Hyperfine quenching of 1s²2s2p ³Po0 in C III and N IV (1995) (0)
Introduction (2019) (0)
B-spline Galerkin methods for the Dirac equation (2008) (0)
Large-scale relativistic calculations of ionization energies and total binding energies of all atoms and positive atomic ions with nuclear charge Z = 1-110 (2015) (0)
A method for finding the asymptotic behavior of a function from its Laplace transform (1954) (0)
Isotope and Hyperfine Effects (2019) (0)
J un 2 01 9 Electron affinities of At and its homologous elements Cl , Br , (0)
Core-polarization effects in neutral technetium (2000) (0)
Comparison between model potential and MCHF approaches in Ca II (1990) (0)
Energy levels and lifetimes of 2P/sup 5/3S3D quartets in Na I (1986) (0)
Two-Electron Systems (2019) (0)
Mathematical Laboratory, numerical analysis, and teaching (2003) (0)
Introduction to Programming the IBM 1620 (1965) (0)

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