The infrared spectrum of ¹²C₂HD: the stretching–bending combination bands in the 1800–4700 cm⁻¹ region

Abstract

The infrared spectrum of ¹²C₂HD has been observed between 1800 and 4700 cm⁻¹ by Fourier transform spectroscopy. The ν₁, ν₂ and ν₃ absorption bands and the associated hot and combination bands involving the bending modes up to υ_t = υ₄ + υ₅ = 2 have been investigated. Altogether, 60 vibrational bands were analysed, leading to the spectroscopic characterization of 31 vibrationally excited states. Several perturbations have been observed, but the transitions involving the perturbing states have not been detected. As a consequence, an appropriate treatment of the vibrational or ro-vibrational interactions has not been possible. A tentative assignment of the perturbing states has been proposed. Eventually, global fits for each fundamental vibration and its associated cold and hot bands have been performed.

Acknowledgements

We thank the University of Bologna and MIUR (PRIN ‘Dinamiche molecolari’) for financial support.