Abstract
Calculations of the adiabatic potential energy curves and the transition dipole moments between the ground (X-1 Sigma(+)) and the first excited (A(1)Sigma(+)) states have been determined for the LiCs and NaCs molecules. The calculations are performed using an ab initio approach based on non-empirical pseudopotentials for Cs+, Li+ and Na+ cores, parameterized l-dependent polarization potentials and full configuration interaction calculations. The potential energy curves and the transition dipole moment are used to estimate the radiative lifetimes of the vibrational levels of the A(1)Sigma(+) state using the Franck-Condon (FC) approximation and the approximate sum rule method. The radiative lifetimes associated with the A(1)Sigma(+) state are presented here for the first time. These data can help experimentalists to optimize photoassociative formation of ultracold molecules and their longevity in a trap or in an optical lattice.