Yong-Ki Kim and J. P. Desclaux, "Relativistic ƒ values for the resonance transitions of Li- and Be-like ions," Phys. Rev. Lett. 36, 139–141 (1976).

L. Armstrong, Jr., W. R. Fielder, and Dong L. Lin, "Relativistic effects on transition probabilities in the Li and Be isoelectronic sequences," Phys. Rev, A 14, 1114–1128 (1976)

We used an extensively modified early version of the program developed by C. Froese Fischer, "A multi-configuration Hartree-Fock program with improved stability," Computer Phys. Commun. 4, 107–116 (1972); 7, 236 (1974).

J. P. Desclaux, D. F. Mayers, and F. O'Brien, "Relativistic atomic wave functions," J. Phys. B 4, 631–642 (1971); J. P. Desclaux, "A multiconfiguration relativistic Dirac-Fock program," Computer Phys. Commun. 9, 31–45 (1975).

I. P. Grant, "Relativistic calculation of atomic structures," Adv. Phys. 19, 747–811 (1970).

J. B. Mann and J. T. Waber, "SCF relativistic Hartree-Fock calculations on the superheavy elements 118–131," J. Chem. Phys. 53, 2397–2406 (1970); "Self-consistent relativistic Dirac-Hartree-Fock calculations of lanthanide atoms," Atomic Data 5, 201–229 (1973).

R. Zalubas, "Present state of analysis of the first spectrum of thorium (ThI)," J. Opt. Soc. Am. 58, 1195–1199 (1968); W. C. Martin, L. Hagan, J. Reader, and J. Sugar, "Ground levels and ionization potentials for lanthanide and actinide atoms and ions," J. Phys. Chem. Ref. I)ata 3, 771–779 (1974); R. Zalubas and C. H. Corliss, "Energy levels and classifiedlines in the second spectrumof thorium (ThII)," J. Res. Natl. Bur. Stand. (U.S.) 78A, 163–246 (1974).

R. D. Cowan, "Atomic self-consistent-field calculations using statistical approximations for exchange and correlation," Phys. Rev. 163, 54–61 (1967). The HX potential consists of the Hartree potential plus a modification of Slater's ρ^{1/3} exchange potential. The originally suggested value *k*_{1} = 0. 7 in the exchange portion has been decreased to 0. 65 on the basis of subsequent experience.

D. A. Liberman, J. T. Waber, and D. T. Cromer, "Self-consistent-field Dirac-Slater wave functions for atoms and ions. I. Comparison with previous calculations," Phys. Rev. 137, A27–A34 (1965); D. A. Liberman and D. T. Cromer, "Relativistic self-consistent field program for atoms and ions," Computer Phys. Commun. 2, 107–113 (1971).

D. F. Mayers, "Relativistic self-consistent field calculation for mercury," Proc. R. Soc. Lond. A 241, 93–109 (1957); R. G. Boyd, A. C. Larson, and J. T. Waber, "Indirect relativistic effect on the 5ƒ electrons in uranium," Phys. Rev. 129, 1629–1630 (1963).

D. C. Griffin, K. L. Andrew, and R. D. Cowan, "Theoretical calculations of the *d*-, *f*-, and *g*-electron transition series," Phys. Rev. 177, 62–71 (1969); "Instabilities in the iterative solution of the Hartree-Fock equations for excited electrons," Phys. Rev. A 3, 1233–1242 (1971).

L. Armstrong, Jr., W. R. Fielder, and Dong L. Lin, "Relativistic effects on transition probabilities in the Li and Be isoelectronic sequences," Phys. Rev, A 14, 1114–1128 (1976)

H. A. Bethe and E. E. Salpeter, Quantum Mechanics of One- and Two-Elcctron Atoms (Springer-Verlag, Berlin, 1957), Sec. 13, especially Eq. (13. 6) and the paragraph following Eq. (13. 11).

R. D. Cowan, "Atomic self-consistent-field calculations using statistical approximations for exchange and correlation," Phys. Rev. 163, 54–61 (1967). The HX potential consists of the Hartree potential plus a modification of Slater's ρ^{1/3} exchange potential. The originally suggested value *k*_{1} = 0. 7 in the exchange portion has been decreased to 0. 65 on the basis of subsequent experience.

D. C. Griffin, K. L. Andrew, and R. D. Cowan, "Theoretical calculations of the *d*-, *f*-, and *g*-electron transition series," Phys. Rev. 177, 62–71 (1969); "Instabilities in the iterative solution of the Hartree-Fock equations for excited electrons," Phys. Rev. A 3, 1233–1242 (1971).

R. D. Cowan and J. B. Mann, "The atomic structure of super-heavy elements," in Atomic Physics, 2, Proceedings of the Second International Conference on Atomic Physics (Plenum, London, 1971), pp. 215–226.

D. A. Liberman, J. T. Waber, and D. T. Cromer, "Self-consistent-field Dirac-Slater wave functions for atoms and ions. I. Comparison with previous calculations," Phys. Rev. 137, A27–A34 (1965); D. A. Liberman and D. T. Cromer, "Relativistic self-consistent field program for atoms and ions," Computer Phys. Commun. 2, 107–113 (1971).

Yong-Ki Kim and J. P. Desclaux, "Relativistic ƒ values for the resonance transitions of Li- and Be-like ions," Phys. Rev. Lett. 36, 139–141 (1976).

J. P. Desclaux, D. F. Mayers, and F. O'Brien, "Relativistic atomic wave functions," J. Phys. B 4, 631–642 (1971); J. P. Desclaux, "A multiconfiguration relativistic Dirac-Fock program," Computer Phys. Commun. 9, 31–45 (1975).

L. Armstrong, Jr., W. R. Fielder, and Dong L. Lin, "Relativistic effects on transition probabilities in the Li and Be isoelectronic sequences," Phys. Rev, A 14, 1114–1128 (1976)

We used an extensively modified early version of the program developed by C. Froese Fischer, "A multi-configuration Hartree-Fock program with improved stability," Computer Phys. Commun. 4, 107–116 (1972); 7, 236 (1974).

I. P. Grant, "Relativistic calculation of atomic structures," Adv. Phys. 19, 747–811 (1970).

D. C. Griffin, K. L. Andrew, and R. D. Cowan, "Theoretical calculations of the *d*-, *f*-, and *g*-electron transition series," Phys. Rev. 177, 62–71 (1969); "Instabilities in the iterative solution of the Hartree-Fock equations for excited electrons," Phys. Rev. A 3, 1233–1242 (1971).

Yong-Ki Kim and J. P. Desclaux, "Relativistic ƒ values for the resonance transitions of Li- and Be-like ions," Phys. Rev. Lett. 36, 139–141 (1976).

D. A. Liberman, J. T. Waber, and D. T. Cromer, "Self-consistent-field Dirac-Slater wave functions for atoms and ions. I. Comparison with previous calculations," Phys. Rev. 137, A27–A34 (1965); D. A. Liberman and D. T. Cromer, "Relativistic self-consistent field program for atoms and ions," Computer Phys. Commun. 2, 107–113 (1971).

L. Armstrong, Jr., W. R. Fielder, and Dong L. Lin, "Relativistic effects on transition probabilities in the Li and Be isoelectronic sequences," Phys. Rev, A 14, 1114–1128 (1976)

J. B. Mann and J. T. Waber, "SCF relativistic Hartree-Fock calculations on the superheavy elements 118–131," J. Chem. Phys. 53, 2397–2406 (1970); "Self-consistent relativistic Dirac-Hartree-Fock calculations of lanthanide atoms," Atomic Data 5, 201–229 (1973).

R. D. Cowan and J. B. Mann, "The atomic structure of super-heavy elements," in Atomic Physics, 2, Proceedings of the Second International Conference on Atomic Physics (Plenum, London, 1971), pp. 215–226.

J. P. Desclaux, D. F. Mayers, and F. O'Brien, "Relativistic atomic wave functions," J. Phys. B 4, 631–642 (1971); J. P. Desclaux, "A multiconfiguration relativistic Dirac-Fock program," Computer Phys. Commun. 9, 31–45 (1975).

D. F. Mayers, "Relativistic self-consistent field calculation for mercury," Proc. R. Soc. Lond. A 241, 93–109 (1957); R. G. Boyd, A. C. Larson, and J. T. Waber, "Indirect relativistic effect on the 5ƒ electrons in uranium," Phys. Rev. 129, 1629–1630 (1963).

C. E. Moore, Atomic Energy Levels, Natl. Bur. Stds. Circe. No. 467 (U. S. GPO, Washington, D. C., 1958), Vol. III.

J. P. Desclaux, D. F. Mayers, and F. O'Brien, "Relativistic atomic wave functions," J. Phys. B 4, 631–642 (1971); J. P. Desclaux, "A multiconfiguration relativistic Dirac-Fock program," Computer Phys. Commun. 9, 31–45 (1975).

H. A. Bethe and E. E. Salpeter, Quantum Mechanics of One- and Two-Elcctron Atoms (Springer-Verlag, Berlin, 1957), Sec. 13, especially Eq. (13. 6) and the paragraph following Eq. (13. 11).

J. C. Slater, Quantum Theory of Atomic Structure (McGraw-Hill, New York, 1960); E. U. Condon and G. H. Shortley, The Theory of Atomic Spectra (Cambridge U. P., Cambridge, England, 1935).

J. B. Mann and J. T. Waber, "SCF relativistic Hartree-Fock calculations on the superheavy elements 118–131," J. Chem. Phys. 53, 2397–2406 (1970); "Self-consistent relativistic Dirac-Hartree-Fock calculations of lanthanide atoms," Atomic Data 5, 201–229 (1973).

D. A. Liberman, J. T. Waber, and D. T. Cromer, "Self-consistent-field Dirac-Slater wave functions for atoms and ions. I. Comparison with previous calculations," Phys. Rev. 137, A27–A34 (1965); D. A. Liberman and D. T. Cromer, "Relativistic self-consistent field program for atoms and ions," Computer Phys. Commun. 2, 107–113 (1971).

R. Zalubas, "Present state of analysis of the first spectrum of thorium (ThI)," J. Opt. Soc. Am. 58, 1195–1199 (1968); W. C. Martin, L. Hagan, J. Reader, and J. Sugar, "Ground levels and ionization potentials for lanthanide and actinide atoms and ions," J. Phys. Chem. Ref. I)ata 3, 771–779 (1974); R. Zalubas and C. H. Corliss, "Energy levels and classifiedlines in the second spectrumof thorium (ThII)," J. Res. Natl. Bur. Stand. (U.S.) 78A, 163–246 (1974).

I. P. Grant, "Relativistic calculation of atomic structures," Adv. Phys. 19, 747–811 (1970).

We used an extensively modified early version of the program developed by C. Froese Fischer, "A multi-configuration Hartree-Fock program with improved stability," Computer Phys. Commun. 4, 107–116 (1972); 7, 236 (1974).

J. B. Mann and J. T. Waber, "SCF relativistic Hartree-Fock calculations on the superheavy elements 118–131," J. Chem. Phys. 53, 2397–2406 (1970); "Self-consistent relativistic Dirac-Hartree-Fock calculations of lanthanide atoms," Atomic Data 5, 201–229 (1973).

R. Zalubas, "Present state of analysis of the first spectrum of thorium (ThI)," J. Opt. Soc. Am. 58, 1195–1199 (1968); W. C. Martin, L. Hagan, J. Reader, and J. Sugar, "Ground levels and ionization potentials for lanthanide and actinide atoms and ions," J. Phys. Chem. Ref. I)ata 3, 771–779 (1974); R. Zalubas and C. H. Corliss, "Energy levels and classifiedlines in the second spectrumof thorium (ThII)," J. Res. Natl. Bur. Stand. (U.S.) 78A, 163–246 (1974).

V. Kaufman and J. Sugar, "Spectrum and energy levels of five-times ionized tantalum (Ta vi)," J. Opt. Soc. Am. 65, 302–309 (1975).

J. P. Desclaux, D. F. Mayers, and F. O'Brien, "Relativistic atomic wave functions," J. Phys. B 4, 631–642 (1971); J. P. Desclaux, "A multiconfiguration relativistic Dirac-Fock program," Computer Phys. Commun. 9, 31–45 (1975).

L. Armstrong, Jr., W. R. Fielder, and Dong L. Lin, "Relativistic effects on transition probabilities in the Li and Be isoelectronic sequences," Phys. Rev, A 14, 1114–1128 (1976)

R. D. Cowan, "Atomic self-consistent-field calculations using statistical approximations for exchange and correlation," Phys. Rev. 163, 54–61 (1967). The HX potential consists of the Hartree potential plus a modification of Slater's ρ^{1/3} exchange potential. The originally suggested value *k*_{1} = 0. 7 in the exchange portion has been decreased to 0. 65 on the basis of subsequent experience.

D. A. Liberman, J. T. Waber, and D. T. Cromer, "Self-consistent-field Dirac-Slater wave functions for atoms and ions. I. Comparison with previous calculations," Phys. Rev. 137, A27–A34 (1965); D. A. Liberman and D. T. Cromer, "Relativistic self-consistent field program for atoms and ions," Computer Phys. Commun. 2, 107–113 (1971).

Yong-Ki Kim and J. P. Desclaux, "Relativistic ƒ values for the resonance transitions of Li- and Be-like ions," Phys. Rev. Lett. 36, 139–141 (1976).

D. F. Mayers, "Relativistic self-consistent field calculation for mercury," Proc. R. Soc. Lond. A 241, 93–109 (1957); R. G. Boyd, A. C. Larson, and J. T. Waber, "Indirect relativistic effect on the 5ƒ electrons in uranium," Phys. Rev. 129, 1629–1630 (1963).

D. C. Griffin, K. L. Andrew, and R. D. Cowan, "Theoretical calculations of the *d*-, *f*-, and *g*-electron transition series," Phys. Rev. 177, 62–71 (1969); "Instabilities in the iterative solution of the Hartree-Fock equations for excited electrons," Phys. Rev. A 3, 1233–1242 (1971).

R. D. Cowan and J. B. Mann, "The atomic structure of super-heavy elements," in Atomic Physics, 2, Proceedings of the Second International Conference on Atomic Physics (Plenum, London, 1971), pp. 215–226.

H. A. Bethe and E. E. Salpeter, Quantum Mechanics of One- and Two-Elcctron Atoms (Springer-Verlag, Berlin, 1957), Sec. 13, especially Eq. (13. 6) and the paragraph following Eq. (13. 11).

On the basis of a variety of trial calculations, we have found it suitable to evaluate *d* at *r* equal to one-quarter of the largest radius for which the series expansion is to be employed.

J. C. Slater, Quantum Theory of Atomic Structure (McGraw-Hill, New York, 1960); E. U. Condon and G. H. Shortley, The Theory of Atomic Spectra (Cambridge U. P., Cambridge, England, 1935).

C. E. Moore, Atomic Energy Levels, Natl. Bur. Stds. Circe. No. 467 (U. S. GPO, Washington, D. C., 1958), Vol. III.