Abstract
The energy level spectrum for a system of four interacting methyl groups belonging to an X(CH3)4 type molecule is calculated by numerical methods. The rotational potential at the site of each methyl group is assumed to be of a three-fold symmetry. The torsion-torsion interaction is defined as a term in the multipole expansion of the electrostatic interaction of two rigid charge distributions. It is shown, that the tunneling frequency characterizing the ground state manifold in the absence of methyl-methyl interaction, splits into a set of closely spaced frequencies.
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Jenčič, I., Peternelj, J., Cvikl, B. et al. The rotational energy levels of four methyl groups. Z. Physik B - Condensed Matter 79, 251–254 (1990). https://doi.org/10.1007/BF01406591
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DOI: https://doi.org/10.1007/BF01406591