Experimental determination of the υ1 fundamental vibrational transition moment for HNC

Hydrogen isocyanide, HNC, was generated by the reaction of translationally energetic H atoms with ClCN, and the resulting products, HCl, HCN and HNC, followed by time-resolved infrared absorption spectroscopy. The subsequent reaction of the Cl and CN species with the H atom precursor, CH3SH, resulted in a definite stoichiometric relationship between the stable products and HNC. This stoichiometric relationship was used to relate the HNC absorption to those for HCN and HCl. The υ1 fundamental vibrational transition moment was determined to be 0.141±0.007 Debye.