1.
Phys Rev Lett
; 109(4): 043005, 2012 Jul 27.
Artículo
en Inglés
| MEDLINE
| ID: mdl-23006085
RESUMEN
The 1s2s (3)S(1)â1s(2) (1)S(0) relativistic magnetic dipole transition in heliumlike argon, emitted by the plasma of an electron-cyclotron resonance ion source, has been measured using a double-flat crystal x-ray spectrometer. Such a spectrometer, used for the first time on a highly charged ion transition, provides absolute (reference-free) measurements in the x-ray domain. We find a transition energy of 3104.1605(77) eV (2.5 ppm accuracy). This value is the most accurate, reference-free measurement done for such a transition and is in good agreement with recent QED predictions.