Infrared–CARS spectrometer with 0.001 cm–1 resolution in the 1900–5000 cm–1 range

A description is given of a high-resolution (~10^–3 cm^–1) spectrometer with an automated data acquisition and processing system, which can be used to record simultaneously both infrared and Raman spectra of a given substance in the frequency range 1900–5000 cm^–1. The results are given of a study of the rotational structure of the vibrational states ν₁(a₁) and ν₃(f₂) of the ²⁸SiH₄ molecule.