Abstract
Abstract : The theory of rotational energy levels of symmetric and asymmetric top molecules is outlined. An expression is derived for the energy levels of symmetric tops, and the difficulties of finding exact energy values for asymmetric tops are discussed. A table of reduced energies, from which the rotational energy levels of any asymmetric top molecule can be simply calculated to seven significant figures is given for values of rotational quantum number J from 1 to 5, and values of the asymmetry parameter K from 1 to 1 in steps of 0. 001. This table is useful in the accurate prediction of frequencies of rotational transitions, chiefly in the microwave region. It can also be used to determine the atomic configurations of molecules and the effects of interaction of rotational states with vibrational and electronic states. Molecules with energy level schemes suitable for design of maser devices to amplify frequencies in the infrared, millimeter, or microwave regions can be selected by means of this table.
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