ИСТИНА

We intend here to share our recent experience in application of the finite-field technique in the frames of relativistic Fock-space coupled cluster methods formulated for conventional (Bloch's) and intermediate effective Hamiltonians to atoms, heavy alkali dimers, group II element halides and hydroxides, as well as to exciplexes formed by heavy alkali metal and rare gas atoms. The dependence of the resulting transition dipoles and lifetimes on the model space size is estimated and the stability of the finite-difference approximations for the derivatives with respect to the applied electric field strength is analyzed. The impact of effective spin-orbit interactions on radiative properties of the studied molecular systems is highlighted. The frontier implementation of computed transition probabilities for optimizing the laser synthesis of ultracold molecules and alkali metal - rare gas laser media is discussed.