“…[89][90][91] The intermolecular interaction between a polar molecule and the cage in which it is embodied gives rise to fluctuations in the induced rotational motion, and therefore off-diagonal elements of the density matrix do not vanish; hence the so-called adiabatic approximation cannot be justified in this physical context,92 as has been verified in the case of CH,Cl, by computer ~imulation~~.…”