The Near Infra-Red Spectra of Linear Y2X2 Molecules Part I. Theory

Abstract
Complete expressions for the rotation‐vibration energies of the linear Y2X2 molecules, through second order of approximation, have been obtained in the form E = hc(GV+FR). The vibrational term GV obtained agrees exactly with that found by Wu and Kiang, but there are numerous points of difference in the rotational term FR.
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