Effect of an external magnetic field on the determination of E1M1 two-photon decay rates in Be-like ions

Summary, in English

In this work we report on ab initio theoretical results for the magnetic-field-induced 2s 2p P-3(0) -> 2s(2) S-1(0) E1 transition for ions in the beryllium isoelectronic sequence between Z = 5 and 92. It has been proposed that the rate of the E1M1 two-photon transition 2s 2p P-3(0) -> 2s(2) S-1(0) can be extracted from the lifetime of the P-3(0) state in Be-like ions with zero nuclear spin by employing resonant recombination in a storage ring. This experimental approach involves a perturbing external magnetic field. The effect of this field needs to be evaluated in order to properly extract the two-photon rate from the measured decay curves. The magnetic-field-induced transition rates are carefully evaluated, and it is shown that, with a typical storage-ring field strength, it is dominant or of the same order as the E1M1 rate for low-and mid-Z ions. Results for several field strengths and ions are presented, and we also give a simple Z-dependent formula for the rate. We estimate the uncertainties of our model to be within 5% for low-and mid-Z ions and slightly larger for more highly charged ions. Furthermore we evaluate the importance of including both perturber states, P-3(1) and P-1(1), and it is shown that excluding the influence of the P-1(1) perturber overestimates the rate by up to 26% for the mid-Z ions.

• Author: Jon Grumer; Wenxian Li; Dietrich Bernhardt; Jiguang Li; Stefan Schippers; Tomas Brage; Per Jonsson; Roger Hutton; Yaming Zou
• Department/s: Mathematical Physics; Department of Physics
• Publishing year: 2013
• Language: English
• Publication/Series: Physical Review A (Atomic, Molecular and Optical Physics)
• Volume: 88
• Issue: 2
• Links: http://dx.doi.org/10.1103/PhysRevA.88.022513
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Condensed Matter Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1050-2947