Study of the A1Σ+ and b3Π0 states in LiCs by a polarization labelling spectroscopy technique

Abstract

A polarization labelling spectroscopy technique was used to investigate the A1Σ+←X1Σ+ band system of the 7LiCs molecule in a heat-pipe oven. All 27 observed vibrational levels of the A state were found to be subject to strong perturbations assigned to interaction with the b3Π0 state. The deperturbation analysis provided molecular constants of the A and b states and a value of the electronic part of the spin–orbit interaction matrix element 〈b3Π0∣Hso∣A1Σ+〉.