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Theoretical Lithium 2 2s2 2p And 2 2p3 2d Oscillator Strengths, Z. C. Yan, Gordon W. F. Drake
Theoretical Lithium 2 2s2 2p And 2 2p3 2d Oscillator Strengths, Z. C. Yan, Gordon W. F. Drake
Physics Publications
The oscillator strengths for the lithium 2 2S2 2P and 2 2P3 2D transitions are calculated to high precision using variational wave functions in Hylleraas coordinates. The calculated oscillator strengths for these transitions are 0.746 957 2(10) and 0.638 570 5(30), respectively. The results resolve disagreements among existing theoretical values and provide definitive predictions. A discrepancy of five standard deviations between the theoretical value and the most accurate measurement of Gaupp et al. [Phys. Rev. A 26, 3351 (1982)] for the 2 2S2 2P transition remains. © 1995 The American Physical Society.
Eigenvalues And Expectation Values For The 1s22s 2s, 1s22p 2p, And 1s23d 2d States Of Lithium, Z. C. Yan, Gordon W. F. Drake
Eigenvalues And Expectation Values For The 1s22s 2s, 1s22p 2p, And 1s23d 2d States Of Lithium, Z. C. Yan, Gordon W. F. Drake
Physics Publications
High-precision variational eigenvalues for the 1s22s 2S, 1s22p 2P, and 1s23d 2D states of lithium are calculated using multiple basis sets in Hylleraas coordinates. Convergence to a few parts in 1010-1011 is achieved. The nonrelativistic energies for infinite nuclear mass are -7.478 060 323 10(31) a.u. for the 1s22s 2S state, -7.410 156 521 8(13) a.u. for the 1s22p 2P state, and -7.335 523 541 10(43) a.u. for the 1s23d 2D state. The corresponding specific isotope shifts due to mass polarization are also calculated with similar accuracy. The 1s22s 2S-1s22p 2P and 1s22p 2P-1s23d 2D transition energies for Li7 and …
Asymptotic-Expansion Method For The Evaluation Of Correlated Three-Electron Integrals, Gordon W. F. Drake, Z. C. Yan
Asymptotic-Expansion Method For The Evaluation Of Correlated Three-Electron Integrals, Gordon W. F. Drake, Z. C. Yan
Physics Publications
An asymptotic-expansion method is presented for the evaluation of correlated three-electron integrals arising in Hylleraas-type variational calculations for lithium and other many-electron atoms. The method proves to be very efficient in accelerating the rate of convergence of an infinite series representation of the integrals. An analytic expression for the terms in the series is derived. © 1995 The American Physical Society.
Retarded Dipole-Dipole Dispersion Interaction Potential For Helium, M. J. Jamieson, Gordon W. F. Drake, A. Dalgarno
Retarded Dipole-Dipole Dispersion Interaction Potential For Helium, M. J. Jamieson, Gordon W. F. Drake, A. Dalgarno
Physics Publications
The retarded dipole-dipole dispersion interaction potential in helium is evaluated from a set of very accurate effective dipole transition frequencies and oscillator strengths already obtained from a variational calculation. The asymptotic form changes from the inverse sixth to the inverse seventh power of the nuclear separation as the atoms move apart. Simple representations of the potential are given for use in scattering and structure calculations. © 1995 The American Physical Society.