Two-electron QED contributions to the ground-state binding energy in He-like Kr34+ ions

被引：9

作者：

Mokler, P. H. ^{[1
]}

Lopez-Urrutia, J. R. Crespo ^{[1
]}

Currell, F. J. ^{[2
,3
]}

Nakamura, N. ^{[3
]}

Ohtani, S. ^{[3
]}

Osborne, C. J. ^{[1
]}

Tawara, H. ^{[1
]}

Ullrich, J. ^{[1
]}

Watanabe, H. ^{[3
]}

机构：

[1] MPI Kernphys, D-69117 Heidelberg, Germany

[2] Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland

[3] Univ Electrocommun, Inst Laser Sci, Tokyo 1820021, Japan

来源：

PHYSICAL REVIEW A | 2008年 / 77卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.77.012506

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The two-electron QED contributions to the ground-state binding energy of Kr34+ ions have been determined in two independent experiments performed with electron beam ion traps (EBIT) in Heidelberg (HD) and Tokyo (BT, Belfast-Tokyo collaboration). X rays arising from radiative recombination (RR) of free electrons to the ground state of initially bare Kr36+ and hydrogenlike Kr35+ ions were observed as a function of the interacting electron energy. The K edge absorption by thin Eu and W foils provided fixed photon energy references used to measure the difference in binding energy Delta E-2e between the H- and He-like Kr ions (Kr35+ and Kr34+, respectively). The two values agree well, yielding a final result of Delta E-2e=641.8 +/- 1.7 eV, confirming recent results of rigorous QED calculations. This accuracy is just of the order required to access screened radiative QED contributions.

引用

页数：8

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