An expansion method for calculating atomic properties X. 1 s 2 1 S -1 snp 1 P transitions of the helium sequence
- 24 October 1967
- journal article
- Published by The Royal Society in Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
- Vol. 301 (1466) , 253-260
- https://doi.org/10.1098/rspa.1967.0206
Abstract
The electric dipole matrix elements connecting the 1s$^{21}$S and 1snp$^1$P states of the helium isoelectronic sequence are calculated exactly to first order in inverse powers of the nuclear charge Z and the differences from 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 1s$^{21}$S-1snp$^1$P transitions for all values of n and all values of Z within a probable error of 2% (table 5). Values of the photoionization cross-sections at the spectral heads are also presented.Keywords
This publication has 3 references indexed in Scilit:
- Innovative ApproachJournal of Marketing, 1967
- Oscillator Strengths for the Helium Isoelectronic Sequence.Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry, 1967
- Bibliography on atomic transition probabilities/Published by National Institute of Standards and Technology (NIST) ,1966