The Low Temperature Rotational Heat Capacities and the Relative Amounts of the Nuclear Singlet, Triplet and Quintet Symmetry Modifications of Methane

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Abstract
There should be three noncombining varieties of methane, the nuclear singlet, triplet and quintet, and two of ammonia, the nuclear doublet and quadruplet, just as there are two of hydrogen, the nuclear singlet and triplet ("para" and "ortho" hydrogen). In this paper the statistical weights of the rotational states have been evaluated and used in conjunction with the Raman spectra data to calculate the heat capacities of each separate variety of methane, of the true equilibrium mixture and of the "frozen equilibrium" mixture. The feasibility of demonstrating experimentally the existence of these different varieties of methane is discussed in the light of the present calculations.

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