Polarizabilities, Stark shifts, and lifetimes of In atom

Abstract

We evaluate the polarizabilities of the 5p_{1/2}, 6s, 6p_{1/2}, and 6p_{3/2} states of In using two different high-precision relativistic methods: linearized coupled-cluster approach where single, double and partial triple excitations of the Dirac-Fock wave function are included to all orders of perturbation theory and an approach that combines the configuration interaction and the coupled-cluster method. Extensive comparison of the accuracy of these methods is carried out. The uncertainties of all recommended values are evaluated. Our result for the 6s-5p_{1/2} Stark shift is in excellent agreement with the recent measurement [Ranjit et al., arXiv:1302.0821v1]. Combining our calculation with this precision measurement allows us to infer the values of the 6p_{1/2} and 6p_{3/2} lifetimes in In with 0.8% accuracy. Our predictions for the 6p_{3/2} scalar and tensor polarizabilities may be combined with the future measurement of the 6s-6p_{3/2} Stark shift to accurately determine the lifetimes of the 5d_j states.