Improved calculation of relativistic shift and isotope shift in Mg I

Abstract

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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Cited by in corpus (22)

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• Relativistic corrections to isotope shift in light ions
• A new era of fine structure constant measurements at high redshift
• Relativistic corrections to transition frequencies of Fe I and search for variation of the fine structure constant
• Isotope shift calculations in Ti II
• Variation of fundamental constants in space and time: theory and observations
• Saturated configuration interaction calculations for five-valent Ta and Db
• Atomic calculations and search for variation of the fine structure constant in quasar absorption spectra
• Coupled-cluster single-double calculations of the relativistic energy shifts in C IV, Na I, Mg II, Al III, Si IV, Ca II and Zn II
• Mid- and far-infrared fine-structure line sensitivities to hypothetical variability of the fine-structure constant
• Atomic transition frequencies, isotope shifts, and sensitivity to variation of the fine structure constant for studies of quasar absorption spectra
• Core correlation effects in multiconfiguration calculations of isotope shifts in Mg I
• Correlation, Breit, and QED effects in spectra of Mg-like ions
• Isotope shifts and relativistic shifts of Cr II for study of alpha-variation in quasar absorption spectra
• Measuring chemical evolution and gravitational dependence of αusing ultraviolet Fe V and Ni V transitions in white-dwarf spectra
• The Mystery of Alpha and the Isotopes
• High-resolution saturation spectroscopy of singly-ionized iron with a pulsed uv laser
• Isotope shifts of the (3s3p)${}^3$P${}_{0,1,2}$ - (3s4s)${}^3$S${}_1$ Mg I transitions
• Sensitivity coefficients to $\alpha$-variation for astrophysically relevant transitions in Ni II