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- W2040388908 abstract "We present an ab initio method of calculation of the isotope and relativistic shifts in atoms with a few valence electrons. It is based on an energy calculation involving the 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 $ensuremath{alpha}$ was smaller at an early epoch. Relativistic shifts are needed to measure this variation of $ensuremath{alpha}$, 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 the isotope shift in magnesium can be calculated to very high precision using our method." @default.
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- W2040388908 date "2005-10-19" @default.
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- W2040388908 title "Calculation of relativistic and isotope shifts in Mg I" @default.
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- W2040388908 doi "https://doi.org/10.1103/physreva.72.044501" @default.
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