Absolute measurement of the relativistic magnetic dipole transition energy in heliumlike argon.

@article{Amaro2012AbsoluteMO,
  title={Absolute measurement of the relativistic magnetic dipole transition energy in heliumlike argon.},
  author={Pedro M.P. Amaro and Sophie Schlesser and Mauro Ant{\'o}nio Moreira Guerra and Eric-Olivier Le Bigot and Jean-Michel Isac and Pascal Travers and Jos'e Paulo Santos and Csilla I. Szabo and Alexandre Gumberidze and Pietro Indelicato},
  journal={Physical review letters},
  year={2012},
  volume={109 4},
  pages={
          043005
        }
}
The 1s2s (3)S(1)→1s(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… CONTINUE READING

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