Potential Curves and Atomic Products for the Dissociative Recombination of K2+ and Rb2+ Relevant to Diode Pumped Alkali Lasers

by Mr. Gilead Caspi

Ben-Gurion University of the Negev
at Quantum optics seminar

Wed, 06 Jul 2022, 15:00
ZOOM only


Special student seminar.
Zoom link: https://us02web.zoom.us/j/86428348094

Dissociative recombination (DR) of K2+ and Rb2+ ions is one of the most important processes in K and Rb diode pumped alkali lasers (DPALs) strongly affecting their power. We report on the calculations of potential energy curves of the K2+ and Rb2+ molecular ions and of the diabatic (^1)Σ^+ ,
(^3)Σ^+, (^1)Δ, (^3)Δ, (^1)Π, (^3)Π, (^1)Φ and (^3)Φ valence states of K2 and Rb2 that provide the routes for DR of the ions. These curves are needed for subsequent calculations of DR rate constants. It was found that the most likely DR routes for K are along the dissociative states 6(^1)Σ_g^+ , 5(^3)Σ_u^+ and 2(^3)∆_u , while for Rb along 6(^1)Σ_g^+ . The excited states of K atoms produced by DR are 42P and 52P. Most of the Rb atoms produced by DR are in the 62P excited state, while a small fraction of the atoms produced by the less likely routes along two states of Rb2 are in the 52P state. This conclusion contradicts the K and Rb DPAL kinetic scheme proposed elsewhere, and thus the kinetic schemes of these DPALs should be modified according to the present results.

Created on 03-07-2022 by Folman, Ron (folman)
Updaded on 03-07-2022 by Folman, Ron (folman)