When describing the motion of two rigid molecular groups which are undergoing mutual rotation with respect to each other about a definite axis and which are at the same time rotating freely in space, there are several ways in which one may fix the coordinate axes which translate with the center of mass of the body. Origin of the axes is placed at the over-all center of mass in order to separate the translational and rotational parts of the Hamiltonian. There still remains a choice in the determination of the orientation of these axes with respect to the two groups. The axes may be fixed in one of the groups or they may have a variable orientation with respect to the two groups. The initial part of the present discussion will be restricted to a discussion of axes in a configuration consisting of a completely asymmetric molecule with an attached symmetric group rotating about the symmetry axis of the symmetric group. Finally some remarks will be made regarding a choice of axes for two internally rotating asymmetric groups.
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