Laser-cooling with an intermediate electronic state: Theoretical prediction on bismuth hydride.

Author(s) Yuan, X.; Guo, H.J.; Wang, Y.M.; Xue, J.L.; Xu, H.F.; Yan, B.
Journal J Chem Phys
Date Published 2019 Jun 14
Abstract

The possibility of laser cooling of bismuth hydride (BiH) molecules has been investigated based on high-level ab initio calculations by considering the core-valence and the spin-orbit coupling (SOC) effects. The potential energy curves of the 12 Λ-S states as well as the 25 Ω states that split from them via SOC are obtained by multireference configuration interaction plus the Davidson correction. The properties of b-X transition are investigated. Based on our calculations, we show that the transition between Ω states b0-X0 of BiH is a possible candidate for laser cooling, with consideration of the intermediate Ω state X1. An optical cycling scheme is proposed by utilizing four lasers at wavelengths around 471 and 601 nm with 5400 cycles for photon absorption/emission and a sub-microkelvin temperature. Our study should shed some light on searching for possible molecular candidates for laser cooling with the existence of an intermediate electronic state.

DOI 10.1063/1.5094367
ISSN 1089-7690
Citation Yuan X, Guo H-, Wang Y-, Xue J-, Xu H-, Yan B. Laser-cooling with an intermediate electronic state: Theoretical prediction on bismuth hydride. J Chem Phys. 2019;150(22):224305.

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