Abstract

Oscillator strengths in both length and velocity approximations have been obtained for transitions between the fifteen lowest lying states of Ca III with dominant configurations 3p⁶, 3p⁵4s, 3p⁵4p, and 3p⁵3d calculated using the program of Hibbert.¹ These states (all corresponding closely to a pure LS coupling scheme) were each represented by about twenty single electron configurations that allowed for internal, semi-internal, and all-external correlations by means of single and double electron excitations to pseudoorbitals $\overline{5}s,\overline{5}p,\overline{4}d,\overline{4}f$. Of these correlations the most important was found to be that linking 3p² to 3d² arrangements, a fact not previously recognized for this ion. The excitation energies calculated for these states agree satisfactorily with the previous experimental results of Borgstrom.² By using these calculated states of Ca III as those of the residual ion in a close-coupling calculation, oscillator strengths between various discrete states of Ca II have been calculated together with the photoionization cross section from the ground state of this ion.

© 1986 Optical Society of America