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By use of the Commutation relations and sum rules, the Darling-Dennison vibration-rotation hamiltonian for a nonlinear 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.
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J. K. G. Watson (2002) studied this question.
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