Effective Dipole Moment of Rotational Transitions of X_2Y Molecules

摘要

Contributions determining the rotational dependence of the effective dipole moment of molecules are calculated for the ground state of H_2S and H_2O molecules. The calculation is carried out in various ordering algorithms of perturbation theory. It is shown that the convergence of the effective dipole moment for the ground state of an H_2O molecule in the polynomial representation is rather slow in the rotational operatory J_z (the convergence radius is K_* ≤ 17). Nonpolynomial forms of the dipole moment as a function of rotational operators are discussed.