Rotational analysis and vibrational predissociation in the ν2 band of HCN dimer

Abstract

The rovibrational infrared spectrum of the bound C–H stretching vibration, ν₂, in the HCN dimer has been analyzed. Observed transition frequencies have been combined with previously recorded microwave data to obtain the following molecular parameters (in cm⁻¹): ν₂=3241.5696(8), α₂=−0.000 110(1), B‘=0.058 233 92(1), B’=0.058 344(1), D^‘_J =0.7013(52)×10⁻⁷, D_J =0.6636(18)×10⁻⁷. The observed full widths at half‐maximum intensity of the observed transitions are consistent with excited state lifetimes of 1.7(4)×10⁻⁹ s.