Key points are not available for this paper at this time.
By use of the commutation relations and sum rules, the Darling-Dennison vibration-rotation hamiltonian for a non-linear molecule is rearranged to the form: The order of the factors in the first term is immaterial, on account of the relation: A simple expansion is given for the μαβ tensor in terms of the normal coordinates.
J. K. G. Watson (Mon,) studied this question.