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Oscillator strengths for S - P and P - D transitions in heliumlike ions

1992; American Physical Society; Volume: 46; Issue: 9 Linguagem: Inglês

10.1103/physreva.46.5397

1538-4446

N. M. Cann, Ajit J. Thakkar,

Nuclear physics research studies

Explicitly correlated wave functions are constructed for the $^{1}\mathrm{S}$, n $^{3}\mathrm{S}$, n $^{1}\mathrm{P}$, n $^{3}\mathrm{P}$, $^{1}\mathrm{D}$, and n $^{3}\mathrm{D}$ states, with n7, of the two-electron ions from He through ${\mathrm{Ne}}^{8+}$. The variational energies are the best available for 180 of the 261 states. Electron-nuclear and electron-electron cusp checks are used to test the wave functions. For each ion, dipole oscillator strengths are calculated for 55 S-P and 40 P-D transitions. Our oscillator strengths are more accurate than previous values for 739 of the 855 transitions considered. Some coefficients for the 1/Z expansions of the energies and oscillator strengths have been estimated as an aid to extrapolating our results to higher nuclear charges.