Laser spectroscopy of the X 1{\Sigma}+ and B 1{\Pi} states of the LiRb molecule

TL;DR

This study uses laser spectroscopy techniques to analyze specific electronic states of the LiRb molecule, providing molecular constants, observing perturbations, and discussing pathways for creating ultra-cold molecules.

Contribution

The paper reports new measurements of molecular constants and observations of rotational perturbations in LiRb, aiding the development of photoassociation methods for ultra-cold molecule production.

Findings

Determined molecular constants for LiRb states.

Observed rotational perturbations in the B 1{\Pi} state.

Identified dissociation energy and implications for ultra-cold molecule formation.

Abstract

We have studied the X 1{\Sigma}+ and B 1{\Pi} states of 7Li85Rb using Laser Induced Fluorescence (LIF) spectroscopy and Fluorescence Excitation Spectroscopy (FES). We extract molecular constants for levels v" = 0-2 of the X 1{\Sigma}+ state and levels v' = 0-20 of the B 1{\Pi} state. For the B 1{\Pi} state, we have observed rotational perturbations in the e-parity component of the v' = 2 level, and determined the dissociation energy. We discuss implications of our measurements in finding efficient photoassociation pathways for production of ultra-cold ground state LiRb molecules, and their detection via state selective ionization.