Comparative analysis of perturbations of the energy, radiative, and magnetic characteristics of electronic-vibrational-rotational states of the hydrogen molecule

A comparative analysis of perturbations of various characteristics of electronic-vibrational-rotational (EVR) levels of the singlet 3d and triplet 3s, 3d complexes of terms of the hydrogen molecule obtained by spectroscopic and semiempirical methods is performed. A quantitative hierarchy of the influence of perturbations is established: for most states under study, perturbations of the probabilities of EVR radiative transitions, the g factors of EVR levels, and the radiative lifetimes of EVR levels are larger, respectively, by 3–5, 3–4, and 1–3 orders of magnitude than the perturbations of EVR terms with respect to the corresponding adiabatic values. It is established that the dependences of the ratios of the perturbed and adiabatic values of the characteristics of EVR levels on the rotational quantum number are significantly different for (i) different characteristics of the same electronic-vibrational states and (ii) the same characteristics of the same vibrational levels but different electronic states (Λ^? and Λ⁺). These differences are explained by the significantly different role of the interference effects of electronic-rotational and electronic-vibrational interactions of EVR states in the perturbation of these characteristics. It is shown that the probabilities of EVR radiative transitions and the g factors of EVR levels may be much more informative for studying these effects than the data on EVR terms.