Inversion Perturbation Research Articles

The coriolis-induced rotational structure in the infrared spectrum of HNCO

A group-theoretical scheme - generally valid for planar C S asymetric tops - is described to predict alterations in the rotational structure of infrared bands of HNCO caused by Coriolis interactions among a′ and a″ vibrations. Through inversion parities and perturbation mixing rules it is shown how the parallel component arises in the ν 6(a″) band, and that no extra features are expected for the in-plane modes. The Coriolis-triad ν 4:ν 5:ν 6 is approximately treated as two separate pairs and the K-dependence of induced parallel rotational transitions is estimated.