Isotope Shifts in Beryllium-, Boron-, Carbon-, and Nitrogen-like Ions from Relativistic Configuration Interaction Calculations

TL;DR

This paper presents relativistic configuration interaction calculations of isotope shifts in beryllium-, boron-, carbon-, and nitrogen-like ions, providing electronic parameters crucial for interpreting isotope shift measurements.

Contribution

It introduces a first-order perturbation theory approach with relativistic CI wave functions to compute isotope shift parameters across multiple isoelectronic sequences.

Findings

Calculated energy levels and isotope shift parameters agree with experimental data

Provides electronic densities at the nucleus for various states

Offers a comprehensive dataset for isotope shift analysis in light ions

Abstract

Energy levels, normal and specific mass shift parameters as well as electronic densities at the nucleus are reported for numerous states along the beryllium, boron, carbon, and nitrogen isoelectronic sequences. Combined with nuclear data, these electronic parameters can be used to determine values of level and transition isotope shifts. The calculation of the electronic parameters is done using first-order perturbation theory with relativistic configuration interaction wave functions that account for valence, core-valence and core-core correlation effects as zero-order functions. Results are compared with experimental and other theoretical values, when available.