Calculation of Spectroscopic Constants and Radiative Parameters for the B1Π–X1Σ+ Electronic Transition of the LiCs Molecule

Abstract

The spectroscopic constants (vibrational, rotational, and centrifugal) and the radiative parameters (Einstein coefficients for spontaneous emission, oscillator strengths for absorption, Franck–Condon factors, R_v'v" centroids, and wavenumbers of rotational lines) of rovibronic transitions in the systems of bands B¹Π–X¹Σ⁺ (0 ≤v'≤ 25, 0 ≤v"≤ 49, j = 0, 30, 50, 60, 70) of the LiCs molecule, as well as the radiative lifetimes of the excited electronic state, are calculated. Calculations are performed based on semiempirical potential curves constructed in this work. The calculated spectroscopic constants are compared with experimental values. The radiative lifetimes are calculated for the first time.