Isotope shift calculations for atoms with one valence electron

Details Isotope shift calculations for atoms with one valence electron Isotope shift calculations for atoms with one valence electron

2003-05-16

arxiv.org/abs/physics/0305068v1

Phys.Rev.A68:022502,2003

Physics

Atomic Physics

11 pages

Scientific paper

10.1103/PhysRevA.68.022502

This work presents a method for the ab initio calculation of isotope shift in atoms and ions with one valence electron above closed shells. As a zero approximation we use relativistic Hartree-Fock and then calculate correlation corrections. The main motivation for developing the method comes from the need to analyse whether different isotope abundances in early universe can contribute to the observed anomalies in quasar absorption spectra. The current best explanation for these anomalies is the assumption that the fine structure constant, alpha, was smaller at early epoch. We test the isotope shift method by comparing the calculated and experimental isotope shift for the alkali and alkali-like atoms Na, MgII, K, CaII and BaII. The agreement is found to be good. We then calculate the isotope shift for some astronomically relevant transitions in SiII and SiIV, MgII, ZnII and GeII.

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