Improved calculation of relativistic shift and isotope shift in Mg I

Details Improved calculation of relativistic shift and isotope shift in Mg I Improved calculation of relativistic shift and isotope shift in Mg I

2005-07-08

arxiv.org/abs/physics/0507062v1

Phys.Rev.A72:044501,2005

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevA.72.044501

We present an ab initio method of calculation of isotope shift and relativistic shift in atoms with a few valence electrons. It is based on an energy calculation involving combination of the configuration interaction method and many-body perturbation theory. This work is motivated by analyses of quasar absorption spectra that suggest that the fine structure constant, alpha, was smaller at an early epoch. Relativistic shifts are needed to measure this variation of alpha, while isotope shifts are needed to resolve systematic effects in this study. The isotope shifts can also be used to measure isotopic abundances in gas clouds in the early universe, which are needed to study nuclear reactions in stars and supernovae and test models of chemical evolution. This paper shows that isotope shift in magnesium can be calculated to very high precision using our new method.

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