Interference effects in hyperfine induced $2s2s ^3P_0, ^3P_2 \to 2s^2 ^1S_0$ transitions of Be-like ions

TL;DR

This study calculates hyperfine induced transition probabilities in Be-like ions, revealing significant interference effects that vary with atomic number and impact the transition rates notably.

Contribution

It provides detailed calculations of hyperfine quenching rates using advanced computational methods, highlighting the non-monotonic interference effects across different atomic numbers.

Findings

Interference effects significantly influence hyperfine quenching rates.

Maximum interference occurs near Z=7 for ^3P_0 transition.

Maximum interference occurs near Z=9 for ^3P_2 transition.

Abstract

The hyperfine induced $2s2p ^3P_0, ^3P_2 \to 2s^2 ^1S_0$ E1 transition probabilities of Be-like ions were calculated using grasp2K based on multi-configuration Dirac-Fock method and HFST packages. It was found that the hyperfine quenching rates are strongly affected by the interference for low-Z Be-like ions, especially for $2s2p ^3P_0 \to 2s^2 ^1S_0$ transition. In particular, the trends of interference effects with atomic number $Z$ in such two transitions are not monotone. The strongest interference effect occurs near Z=7 for $2s2p ^3P_0 \to 2s^2 ^1S_0$ E1 transition, and near Z=9 for $2s2p ^3P_2 \to 2s^2 ^1S_0$ E1 transition.