THE SPIN-SPIN MIXING OF 1S3S S-3(1) AND 1S3D D-3(1) STATES IN THE HELIUM ISOELECTRONIC SEQUENCE

Citation
Vg. Palchikov et G. Vonoppen, THE SPIN-SPIN MIXING OF 1S3S S-3(1) AND 1S3D D-3(1) STATES IN THE HELIUM ISOELECTRONIC SEQUENCE, Physica scripta. T, 52(4), 1995, pp. 366-371
Citations number
23
Categorie Soggetti
Physics
Journal title
ISSN journal
02811847
Volume
52
Issue
4
Year of publication
1995
Pages
366 - 371
Database
ISI
SICI code
0281-1847(1995)52:4<366:TSMO1S>2.0.ZU;2-X
Abstract
Both relativistic acid nonrelativistic analytical calculations of the off-diagonal matrix elements between excited \1s3s S-3(1)> and \1s3d D -3(1)) states of He-like atoms have been performed, taking into accoun t the spin-spin interaction of the first order of perturbation theory. The considered values of nuclear charge Z range from Z=2 to Z=100. Th e nonrelativistic results for neutral helium agree well with earlier n umerical estimates. The relativistic approach of evaluation of the off -diagonal matrix elements of He-like multicharged ions is analyzed in some details, using the hydrogenlike approximation for the basis wave functions. A precise evaluation of the one-photon exchange correction to the \1s3s S-3(1) > and \1s3d D-3(1)> energies is made.