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MASAZUMI ISHIGURO, ROGER E. MILLER, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.
High resolution infrared spectra of of the HCN-( o -H2) and -( p -D2) in the gas phase have been observed and analyzed for the first time. Spectra for the CH-stretching band were recorded by using a color center laser spectrometer combined with molecular beam opto-thermal detection. No spectra for HCN-( p -H2) and HCN-( o -D2) were observed. The observed spectra for HCN-( o -H2) and ( p -D2) show a typical pattern for parallel band of a linear molecule. Since the Q -branches were absent and the R (0) lines were observed, these bands were assigned to
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bands. The rotational constants, B0, obtained from Dopplar free spectra (FWHM = 20 MHz) were 0.43025(18) cm-1 and 0.26630(8) cm-1 for HCN-( o -H2)1 and for -( p -D2)1, respectively. For both species, the line broadening due to vibrational predissociation has not been observed. The vibrational frequencies for the vdW stretching mode were derived to be 30.2 cm-1 and 28.4 cm-1 for HCN-( o -H2) and -( p -D2), respectively.