Observation of high vibrational excitation in HCN molecules produced from 193 nm photolysis of 1,3,5-triazine

Abstract

Infrared emission from the ν2 bending mode and ν3 C-H stretching mode of HCN have been observed following 193 nm pulsed excimer laser photolysis of 1,3,5-triazine. Using a simple harmonic oscillator analysis, the number of ν2 bending quanta produced in HCN from photolysis of sym-triazine was found to be 70 times larger than the number of ν3 C-H stretching quanta. The combination of a high density of bending vibrational states in HCN and favorable geometry changes which occur in going from 1,3,5-triazine to three HCN molecules, appear to give an unusually pure distribution which maximizes vibrational energy in the HCN bending mode. © 1984 American Institute of Physics.