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 υt = 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.
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