The photolysis of N15NO and NN15O have been investigated using 1470- and 1830-A light. The products include small amounts of N230, as well as N229. The appearance of N230 shows that there are two primary processes occurring, one of which is the dissociation to a nitrogen atom and a nitric oxide molecule, the other dissociation to an oxygen atom and a nitrogen molecule. In addition, at 1470 A a photoexcited molecule is formed which is capable of dissociating another nitrous oxide molecule.