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+〉.
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