Vibrational relaxation times of NO diluted in Ar were measured by monitoring infrared emission of NO at 5.3 μ. Measurements were made in shock waves over the temperature range of 900–2700°K. NO was found to relax exponentially and the relaxation times of NO in NO–NO and NO–Ar collisions were estimated. The results were expressed by logpτNO–NO = 6.1T−1/3 − 1.1 atm·μsec and logpτNO–Ar = 14.7T−1/3 + 0.15 atm·μsec.
Articles you may be interested inTime dependent measurements of nitrous oxide and carbon dioxide collisional relaxation processes by a frequency down-chirped quantum cascade laser: Rapid passage signals and the time dependence of collisional processes Vibrational relaxation of CO2 (Va) diluted in Ar was studied over the temperature range 700-2000oK by using a shock-tube technique. Measurements were made by monitoring the infrared emission of the asym-me~ric stretching mode of CO2 at 4.3 p,. The relaxation profile of CO2 (va) was found to be nonexponential by mtramolecular V-V couplings with other modes and all the modes in CO 2 had approximately the same final relaxation time 'Tj on CO2-Ar collisions. The relaxation time for the V-V process between Vl.2 and Va modes was estimated by using a simplified two-modes model.
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