An attempt is made to show in a straightfOlward way how a body-fixed (BF) frame of reference may be constructed for a diatomic molecule such that rotational and translational motions could be described as motions of the BF frame and internal (vibrational and electronic) motions could be described with respect to the BF frame. A diatomic molecule is a special case which we do not need to impose any condition, such as the Eckart's conditions, on the BF frame. The correct form of the total angular momentum operators is derived quantum mechanically. The Hougen-Watson isomorphic Hamiltonian is rederived. For conformity, the method is developed in strict analogy to the first author's previous works, with the necessary variations for the diatomic molecule.
A MAGHARI ,R ISLAMPOUR ,
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