Ba$^+$ Quadrupole Polarizabilities: Theory versus Experiment

TL;DR

This paper compares theoretical calculations of Ba$^+$ quadrupole polarizability with existing experimental data, highlighting discrepancies and emphasizing the need for further precise measurements.

Contribution

The paper provides a relativistic coupled-cluster calculation of Ba$^+$ quadrupole polarizability and discusses its agreement or disagreement with experimental results.

Findings

Calculation agrees with one experimental value within error bars.

Disagreement with two experimental measurements.

Highlights need for more accurate experiments.

Abstract

Three different measurements have been reported for the ground state quadrupole polarizability in the singly ionized barium (Ba$^+$) which disagree with each other. Our calculation of this quantity using the relativistic coupled-cluster method disagrees with two of the experimental values and is within the error bars of the other. We discuss the issues related to the accuracy of our calculations and emphasize the need for further experiments to measure the quadrupole polarizability for this state and/or the 5D states.