Testing QED screening and two-loop contributions with He-like ions

被引：54

作者：

Bruhns, H. ^{[1
]}

Braun, J. ^{[1
]}

Kubicek, K. ^{[1
]}

Crespo López-Urrutia, J. R. ^{[1
]}

Ullrich, J. ^{[1
]}

机构：

[1] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.99.113001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report wavelength measurements of H-like and He-like ions obtained with a novel x-ray spectrometer at the Heidelberg Electron Beam Ion Trap. The experimental uncertainty for the Lyman-alpha(1) wavelength in Cl16+ is reduced by a factor of 3 and, as expected, excellent agreement with theory is maintained. For the resonance line in He-like Ar16+, an uncertainty of only delta lambda/lambda=2x10(-6) was achieved. This is the most precise x-ray wavelength reported for highly charged ions to date, and allows to test recent predictions on QED two-electron and two-photon radiative corrections for He-like ions. The results also point to the advantages of establishing absolute x-ray wavelength standards using Lyman-alpha transitions (in the present case Ar17+ Lyman-alpha(1)) to supersede the current ones.

引用

页数：4

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