USE OF THE ANOMALOUS STARK EFFECT FOR THE APPROXIMATE DETERMINATION OF TORSIONAL ENERGY SPLITTINGS

An advantageous use of the anomalous Stark effect for the determination of the torsional energy splittings is proposed. The method is applicable in those cases where the dipole moment component connecting the torsional states of different parity has an experimentally observable magnitude. The analysis of the Stark spectrum observed in the spectrum of the N-cis lone-electron-pair gauche isomer of allylamine is presented as an example. The Stark effects of those transitions (a-type and b-type) which are inside the same vibrational state (0+ and 0-), are used for the fitting of the μa, μb, and μc dipole moment components as well as the torsional energy splitting Δνtors. The values obtained are compared to more accurate values derived by other methods. The possible use for predicting large torsional splittings is discussed. © 1979.