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The m ajority of contributions to the Discussion have been concerned w ith th e ! ultra-violet and infra-red spectral regions, b u t im portant considerations also arise! a t lower frequencies. These have been less fully studied because of experimental § difficulties, b u t experiments show th a t changes in the spectrum consequent on* change of state m ay be quite large. In the gas phase, rotational energy levels are usually described in quantum -! mechanical language in term s of the angulardoi:10.1098/rspa.1960.0053 fatcat:qhmc7wtm4zbh5mzrtxg5rvlxjq