Evaluation of two-photon exchange graphs for excited states of highly charged heliumlike ions - art. no. 052501

Authors
Mohr, PJ Sapirstein, J
Citation
Pj. Mohr et J. Sapirstein, Evaluation of two-photon exchange graphs for excited states of highly charged heliumlike ions - art. no. 052501, PHYS REV A, 6205(5), 2000, pp. 2501
Citations number
18
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW A
ISSN journal
10502947 → ACNP
Volume
6205
Issue
5
Year of publication
2000
Database
ISI
SICI code
1050-2947(200011)6205:5<2501:EOTEGF>2.0.ZU;2-5
Abstract
Energy shifts arising from two-photon-exchange graphs are calculated for n = 2 triplet states of heliumlike ions and tabulated for the range of nuclea r charges Z = 30-92. The results are compared with second-order many-body p erturbation theory (MBPT), and the differences are identified as QED effect s associated with retardation and negative energy states not included in MB PT.