Effective Operator of the Coordinate Electric Dipole Moment for the First Triad of Vibrational States of the H2O Molecule

摘要

The most simple expression for an effective operator of the coordinate electric dipole moment for the first triad of vibrational states of the H2O molecule in the ground electronic state was obtained in an arbitrary order of perturbation theory as a Taylor series expansion in dynamic variables. The method employed is based on the assumption that the vibrational quasi-degeneracy observed is not accidental but is caused by the presence of a symmetry group for a certain main contribution to the molecular motion under consideration, which is larger than the point group of a molecule.