Oscillator strengths forS-PandP-Dtransitions for singly excited states of two-electron ions viaZ-dependent perturbation theory

1 May 1989

journal article
research article
Published by American Physical Society (APS) in Physical Review A

Vol. 39 (9) , 4387-4399
https://doi.org/10.1103/physreva.39.4387

Abstract

Oscillator strengths for electric dipole transitions between singly excited S, P, and D states are calculated via Z-dependent perturbation theory. The transition matrix elements through first order are obtained from variational perturbation first-order wave functions. Second-order expansion coefficients for the matrix elements are then estimated with the aid of several approximants. These matrix elements, together with accurate transition energies, yield oscillator strengths for transitions between all S-P and P-D transitions between states of two-electron ions with principal quantum number up to 9 and for values of the nuclear charge up to approximately 30.

Keywords

This publication has 13 references indexed in Scilit:

Accurate nonrelativistic oscillator strengths for $P - D$ transitions in the helium isoelectronic sequence
Physical Review A, 1984
Accurate oscillator strengths for neutral helium
Physical Review A, 1984
$S$ , $P$ , and $D$ states of two-electron ions via $Z$ -dependent perturbation theory
Physical Review A, 1983
Unified relativistic theory for $1 s 2 p {}^{3}P_{1} - 1 s^{2} {}^{1}S_{0}$ and $1 s 2 p {}^{1}P_{1} - 1 s^{2} {}^{1}S_{0}$ frequencies and transition rates in heliumlike ions
Physical Review A, 1979
Oscillator strengths of transitions between low-lying S and P states of helium-like ions
The Astrophysical Journal, 1977
Radiative decays of the $n = 2$ states of He-like ions
Physical Review A, 1977
$f$ Values for Transitions between the Low-Lying $S$ and $P$ States of the Helium Isoelectronic Sequence up to $Z = 10$
Physical Review A, 1971
Oscillator Strengths for the Helium Isoelectronic Sequence.
Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry, 1967
Oscillator Strengths for Singlet and Triplet Series in Neutral Helium
The Astrophysical Journal, 1966
$f$ Values for Transitions between the $1 {}^{1}S$ , $2 {}^{1}S$ , and $2 {}^{3}S$ , and the $2 {}^{1}P$ , $2 {}^{3}P$ , $3 {}^{1}P$ , and $3 {}^{3}P$ States in Helium
Physical Review B, 1964