Abstract
High-resolution Fourier transform spectra of ClCN in the 1200-2140 and 4000-5000 cm−1 spectral regions have been recorded to measure the line positions for the ν1 + 2ν2, 2ν1, 4ν2, ν3 − ν2, 2ν3, and ν2 + 2ν3 bands and some associated hot bands. A total of 13 bands have been observed for 35Cl12C14N, and 6 for 37Cl12C14N. We report also the analysis of 20 new bands identified in previously studied regions (8 for 35Cl12C14N, 9 for 37Cl12C14N, and 1 each for 35Cl12C15N, 37Cl13C14N, and 37Cl12C15N. A global analysis has been applied to 35Cl12C14N and 37Cl12C14N on the basis of all data (microwave, radiofrequency, and infrared) available for energies in their electronic ground state. A statistical agreement is obtained with the whole set of data and a set of 80 molecular parameters have been determined for the two isotopomers. Effective constants and their uncertainties have been calculated up to the eighth order in J(J + 1) for vibrational levels up to more than 5000 cm−1.
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