Article

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

10/2011; DOI:10.1103/PhysRevA.84.052520
Source: arXiv

ABSTRACT 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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Keywords

ab initio calculations

astronomical determination

calculations

CI+MBPT

complete way

configuration interaction

consistent

contrasts

corrections

Cr II

five-valence-electron system

low-energy spectra

previous ions

relativistic shifts

single-valence-electron diagrams