Forbidden M1 and E2 transitions in monovalent atoms and ions

TL;DR

This paper provides high-precision relativistic calculations of forbidden M1 and E2 transitions in various monovalent atoms and ions, crucial for fundamental physics tests and precision measurements.

Contribution

It offers the first systematic high-precision relativistic analysis of forbidden transitions in multiple monovalent atoms and ions, including detailed uncertainty assessments.

Findings

Calculated recommended matrix elements with uncertainties.

Compared theoretical lifetimes with experimental data.

Analyzed effects of relativistic and correlation corrections.

Abstract

We carried out a systematic high-precision relativistic study of the forbidden magnetic-dipole and electric-quadrupole transitions in Ca+, Rb, Sr+, Cs, Ba+, Fr, Ra+, Ac2+, and Th3+. This work is motivated by the importance of these transitions for tests of fundamental physics and precision measurements. The relative importance of the relativistic, correlation, Breit correction, and contributions of negative-energy states is investigated. Recommended values of reduced matrix elements are presented together with their uncertainties. The matrix elements and resulting lifetimes are compared with other theoretical values and with experiment where available.