Abstract
The frame transformation for an s-wave electron in the field of a degenerate symmetric top molecular ion core is used to interpret the results of a series of rotational bandshape fittings of one- and two-photon absorption spectra of methyl iodide in the region of the lowest Rydberg transitions. The frame transformation is defined between alternative representations of the total wavefunction in which the spin of the Rydberg electron is successively decoupled from the molecular frame to the laboratory frame. It is shown that uncoupling of the spin from the molecular axis is essentially complete in the 6s states of CH3I. Calculations are also presented which indicate that the dynamic Jahn-Teller interaction leds to substantial angular momentum quenching in some vibronic levels of this molecule.
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