Infrared spectroscopy of the hydrogen cyanide dimer

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Abstract
Sub-Doppler resolution infrared spectra have been obtained and assigned for four vibrational bands of the hydrogen cyanide dimer, namely the ν1 and ν2 C–H stretching fundamentals and two hot bands. Accurate molecular constants are reported for all of these. In the case of the free C–H stretch (ν1 ), Stark spectra have also been recorded in order to determine the dipole moments of this complex in both the ground and vibrationally excited states. The linewidths obtained for the individual rovibrational transitions indicate that the vibrational predissociation lifetime of this complex is highly mode specific.

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