"Time-resolved fine structure mixing of cesium induced by helium and ar" by Ricardo C. Davila, Glen P. Perram et al. 10.1088/1361-6455/aa8da4">
 

Time-resolved fine structure mixing of cesium induced by helium and argon

Document Type

Article

Publication Date

10-31-2017

Abstract

The rates for fine structure mixing and quenching of the moderately excited 82D5/2 and 82D3/2 states of cesium under collision with argon and the more impulsive helium have been measured, using two-photon pulsed excitation and time-resolved fluorescence techniques. The pressure dependence of the eigenvalues of the rate matrix yields very rapid rate coefficients of 2.6 ± 0.2 × 10-9 cm3/(atom s) for He and 5.2 ± 0.4 × 10-10 cm3/(atom s) for Ar, about two-three times faster than for the Cs 72D5/2 ⇌ 72D3/2 relaxation. The quenching rates are also rapid, 1.07 ± 0.04 × 10-10 cm3/(atom s) and 9.5 ± 0.7 × 10-11 cm3/(atom s) for He and Ar respectively. The rapid fine structure rates are explained by the highly impulsive nature of the collisions, and the large average distance of the valence electron from the nucleus. Quenching rates (intra-multiplet transfer) are likely enhanced by the closely spaced, 92P levels. The observed rates are compared with the predictions from time-dependent perturbation theory.

Comments

© 2017 IOP Publishing Ltd

This article is available from The Institute of Physics (IOP), through subscription or purchase using the DOI link below.

Co-author Ben Eshel was also affiliated with the Oak Ridge Institute for Science and Education (ORISE) at the time of publication.

Source Publication

Journal of Physics B: Atomic, Molecular and Optical Physics

This document is currently not available here.

Share

COinS