Isotope shifts and relativistic shifts of Cr II for study of alpha-variation in quasar absorption spectra

Details Isotope shifts and relativistic shifts of Cr II for study of alpha-variation in quasar absorption spectra Isotope shifts and relativistic shifts of Cr II for study of alpha-variation in quasar absorption spectra

2011-10-11

arxiv.org/abs/1110.2292v1

Phys. Rev. A 84, 052520 (2011)

Physics

Atomic Physics

6 pages, 1 figure, 6 tables

Scientific paper

10.1103/PhysRevA.84.052520

We use the combination of configuration interaction and many-body perturbation theory method (CI+MBPT) to perform ab initio calculations the low-energy spectra of Cr II with high accuracy. It is found that second-order MBPT diagrams should be included in a consistent and complete way for the MBPT to improve the accuracy of calculations in this five-valence-electron system. This contrasts with previous ions with fewer valence electrons where it was found that single-valence-electron diagrams dominate the corrections. Isotope shifts and relativistic shifts (q-values) are calculated for use in astronomical determination of the fine-structure constant in quasar absorption spectra.

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