A Reaction (5.15) has a large exothermicity and it is known experimentally that the formed NO is in vibrationally and rotationally excited. Akagi et al. (1999) found from the experiments of 18O(1D) + N216O N18O + N16O using the oxygen isotopes that the N16O in the original N16O molecule is formed mostly in v = 0, 1 without vibrational excitation and the newly formed N18O is produced in highly vibrationally excited levels in v = 4−15. Further, Tokel et al. (2010) recently reported in the molecular beam experiment that the NO vibrational levels (v = 0~9) showed inverted population, which suggests that there are two reaction pathways, one gives the statistical distribution and another gives the inverted distribution.