Vibrational Relaxation of Nitric Oxide

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Abstract
The vibrational relaxation of nitric oxide has been determined in a shock tube with a spectrophotometric technique. The temperature range covered was from 450 to 1300°K, and relaxation times of the order of 5–10 μsec were observed at densities of about 0.07 atmos. From the relaxation times P1–0, the probability of de‐excitation from the first vibrational level, was found to be about 8×10—4 at 500°K. Computations of P1–0 made according to the theory of Schwartz, Slawsky, and Herzfeld with an interaction potential derived from viscosity measurements are the order of 2×10—5 times smaller than the experimental values. The use of a potential derived from an (NO2) complex appears to account for the discrepancy.