Calculation of Stark-induced absorption on the 6s6p ^3P_1 - 6s^2 ^1S_0 transition in Hg

TL;DR

This paper presents relativistic many-body calculations of Stark-induced absorption in mercury atoms, revealing that M1-E1 transitions dominate and highlighting the importance of correlation effects for accurate predictions, which can aid experimental searches for atomic EDMs.

Contribution

The study provides a detailed relativistic many-body calculation of Stark-induced absorption in mercury, improving upon previous estimates by including correlation effects.

Findings

M1-E1 absorption dominates over E2-E1.

Results differ significantly from earlier central field estimates.

Correlation effects are crucial for accurate absorption coefficient calculations.

Abstract

We carry out relativistic many-body calculations of the Stark-induced absorption coefficient on the 254-nm $6s6p ^3P_1 (F=1/2) - 6s^2 ^1S_0$ line of $^{199}$Hg atom, the effect considered before by Lamoreaux and Fortson using a simple central field estimate [Phys. Rev. A {\bf 46}, 7053 (1992)]. The Stark-induced admixing of states of opposite parity opens additional M1 and E2 transition channels. We find that the resulting M1-E1 absorption dominates over E2-E1 absorption. The value of the E2-E1 absorption coefficient depends strongly on the details of treatment of the correlation problem. As a result, our numerical values differ substantially from those of the earlier central field calculation. Reliable calculation of this effect can enable a useful experimental check on the optical technique being used to search for a permanent electric dipole moment of the $^{199}$Hg atom.