Abstract
The far-infrared spectrum of the lowest-lying rovibrational band system ν 5 of cyanogen, NCCN, was measured in the wavenumber range from 180 to 280 cm −1. A Fourier transform interferometer was used. Absolute rovibrational line intensities of the fundamental and the first hot band were evaluated. The pure vibrational transition moment matrix elements for the fundamental and the first hot band, |〈μ (00),(01) vib〉| and |〈μ (01),(02) vib〉|, were determined to be 0.1812(19) and 0.1790(30) D, respectively. Furthermore, four nitrogen-broadened spectra of this band system were measured in the pressure range between p N 2 = 8 and 30 mbar (0.1 mbar cyanogen), yielding a nitrogen-broadening coefficient of 0.12 cm −1/atm decreasing slightly with increasing rotational quantum number J. No pressure-induced shifts of line positions were observed in this pressure range. The effects of instrumental distortion on line intensities are discussed.
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