Coriolis Perturbations in the Spectra of Silane and Germane

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Abstract
A Coriolis perturbation on the rotational structure of the fundamental frequency, v4 has been computed for silane and germane. Matrix elements of the Coriolis operator, A for the lines P(9), P(10) and Q(10) have also been obtained. The envelope of the resulting absorption curve has been compared with the experimental curve and good agreement found. The most striking difference in the two spectra is that in the case of silane, the Q branch degrades toward lower frequencies and in germane, towards higher frequencies. This is shown to be due to the relative position of the infra-red inactive frequency, v2 to which the perturbation is due.