Abstract
The Fourier transform infrared (FTIR) spectrum of the c-type ν8 band of 13C2HD3 was recorded for the first time at a unapodized resolution of 0.0063cm−1 in the wavenumber region of 830–1000cm−1. Through the fitting of a total of 1057 assigned infrared transitions using Watson’s A-reduced Hamiltonian in the Ir representation, rovibrational constants for the upper state (v8=1) up to five quartic centrifugal distortion terms were derived for the first time with a root-mean-square (rms) deviation of 0.00073cm−1. The band center of ν8 of 13C2HD3 was found to be 913.011021(55)cm−1. Ground state rovibrational constants up to five quartic terms of 13C2HD3 were also determined from a fit of 453 ground state combination-differences from the present infrared measurements with an rms deviation of 0.00072cm−1 for the first time. The uncertainty of the measured infrared lines was estimated to be ±0.0012cm−1. From the ground state rotational constants, the inertial defect of 13C2HD3 was calculated to be 0.06973(16)uÅ2, showing the high planarity of the molecule.
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