Author： Maki A. Quapp W. Klee S. Mellau G.C. Albert S.
Publisher： Academic Press
ISSN： 0022-2852
Source： Journal of Molecular Spectroscopy, Vol.174, Iss.2, 1995-12, pp. : 365-378
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Abstract
The electric dipole transition moments and vibration-rotation constants of the CN stretching bands of H 12 C 14 N and six other isotopomers are reported. Hot-band measurements show the vibrational dependence of the constants. Infrared absorption spectra were measured with a Fourier transform interferometer and a multipass absorption cell with a path length of up to 240 m. The transition wavenumber measurements were used to derive vibration-rotation constants, and the intensities of individual lines were used to determine the transition dipoles and Herman-Wallis factors. The unusually small transition dipole coupled with the large dipole moment of HCN (2.98 D) results in very large values for the first Herman-Wallis factor A 1 and distorts the shape of the intensity envelope of the band. These measurements show how changes in the masses of the heavy atoms in the molecule have a systematic effect on the transition dipole and on the intensity pattern of the CN stretching band.
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