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The behavior of the gamma bands of NO, observed in emission from low-pressure oxygen atom-hydrazine flames, suggests that the electronically excited NO is formed by energy transfer rather than directly in a chemical reaction. The addition of NO to the flame increased the emission intensity of the gamma bands and decreased the emission from NH. The energy carrier appears to have a lifetime longer than 0.00003 sec, suggesting a metastable state. The most likely energy carrier is the lowest triplet state of nitrogen, N2(A(3)Sigma). Two additional experiments support this assignment: the addition of mercury vapor to the flame results in emission of the 2537-A mercury line and addition of NO to a system known to contain N2(A(3)Sigma) resulted in the almost exclusive emission of the gamma bands of NO. (Author)