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

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE