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Gas‐phase reaction of Ba with N2O. II. Mechanism of reaction

A reaction mechanism and a correlation diagram argument are presented to account for the high photon yield of the chemiluminescent reaction of Ba atoms with N2O. Most BaO molecules appear to be formed initially in the long‐lived a3π state and to be transferred subsequently by collisions into the shorter‐lived A1Σ+ state. This mechanism accounts for numerous kinetic and spectroscopic observations of BaO. The arguments suggest that reactions of alkaline earth atoms with N2O and with O3 may be suitable for electronic‐transition chemical lasers.