Accession Number:
AD0691078
Title:
AN EXPANSION METHOD FOR CALCULATING ATOMIC PROPERTIES. X. (1S2 SINGLET S)-(1s np SINGLET P) TRANSITIONS OF THE HELIUM SEQUENCE,
Descriptive Note:
Corporate Author:
QUEEN'S UNIV BELFAST (NORTHERN IRELAND) SCHOOL OF PHYSICS AND APPLIED MATHEMATICS
Personal Author(s):
Report Date:
1969-01-01
Pagination or Media Count:
34.0
Abstract:
The electric dipole matrix elements connecting the 1s2 singlet S and 1s np singlet P states of the helium isoelectronic sequence are calculated exactly to first order in inverse powers of the nuclear charge Z and the differences in the Hartree-Fock approximation are shown to correspond to virtual transitions of the 1s electrons. Comparison of the oscillator strengths predicted by a screening approximation with more accurate values reveals a regular variation in the error contained in the screening approximation, the correction of which allows the prediction of oscillator strengths and probabilities of 1s2 singlet S-1s np singlet P transitions for all values of n and all values of Z within a probable error of 2. Values of the photoionization cross sections at the spectral heads are also presented. Author
Descriptors:
Subject Categories:
- Atomic and Molecular Physics and Spectroscopy