Theory of Internal Over-All Rotational Interactions. IV. Stark Effect in Nonrigid Internal Rotors

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Abstract
When a uniform electric field is applied to a nonrigid internal rotor, the ``Stark pattern'' of the energy levels is dependent upon the torsional motion. This dependence enters as a centrifugal distortion interaction and by means of the so‐called ``repulsive effect'' of the potential barrier to internal rotation. These effects are small but observable and require that appropriate corrections be made in order to obtain an accurate and meaningful dipole moment from Stark effect measurements. The theory of the Stark effect in vibrating internal rotors has been formulated in this article with particular emphasis on its application to a molecule of C3v symmetry such as CH3SiH3. Krongelb and Strandberg have observed this effect in CH3SiH3.