Photodissociation of N₂O at 193nm: Formation and Quenching of Vibrational Excited NO（v） by N₂O

The Photodissociation of N₂O at 193nm has been investigated by time-resolved Fourier transform infrared emission spectroscopy. The emission spectra of NO（v） from the sequential reaction with 30/μs to 600/μs delay were recorded. The vibrational quantum number v was observed as high as 11. The result agrees with the head-on reaction mechanism of O（¹D）and N-N-O. By means of simulated spectra, the vibrational population of NO（v） and its time evolution were obtained, therefore the V-V energy transfer rate constants for NO（v=1-11） by N₂O were calculated. These rate constants were analyzed through SSH theory. We found for v=1-4NO（v）+N₂O（000）→NO（v—1）+N₂O（001）—|ΔE₁|(cm^-1)is predominant, for v=5—11NO（v）+N₂O（000）→NO（v—1）+N₂O（100）+|ΔE₂|(cm^-1) is the major energy transfer process. Its energy transfer probability P_v can be express as following:P_v/v = exp（-a₁ ×|ΔE₁|-b₁）+exp（-a₂×|ΔE₂|-b₂）a₁, a₂, b₁, b₂ are constants for corresponding processes.a₁=0.0170cm, b₁=2.50, a₂=0.0115cm,b₂=3.51. We also analyzed V-V energy transfer rate cnstants for CO（v=4-13） by CO₂ and by N₂O in literature similarly.