Abstract
The temperature dependence of the vibrational relaxation of NO(ν = 1) and NO(ν = 2) by NO has been investigated over the range 220–470K. The vibrationally excited NO was produced by the pulse radiolysis of dilute NO-Ar mixtures and temporal dependence of the NO(ν = 1) and NO(ν = 2) followed by UV absorption spectrophotometry. The results for the self-relaxation of NO(ν = 1) are in good agreement with previous measurements exhibiting a minimum in the relaxation rate constant near 300 K; however, the results for the V-V exchange between NO(ν = 2) and NO(ν = 0) are approximately a factor of two smaller that the results calculated from the relaxation rate constant of the reverse 1+1 process and detailed balance at 300 K. The temperature dependence of the V-V exchange rate constant is in good agreement with calculated estimates based on Rapp's SSH theory for V-V transfer. The long-range dipole-dipole formulation must be extended to other than 1Σ state systems in order to explicitly take into account the influence of spin-orbit coupling on the state-to-state rate constants for vibrational relaxation.
Published Version
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