Collisional deactivation of the c 1π and A 3π states of imino radicals

The photolysis of ammonia-d0 and -d3 was studied at each of the three wavelengths, Lyman-α (121.6 nm), Kr resonance lines (123.6, 116.5 nm), and Xe resonance lines (147.0, 129.6 nm). For Lyman-α, Kr resonance lines, and 129.6 nm, NH(c 1π) emission was observed. In the Kr sensitization, both NH(c 1π) and (A 3π) emissions were detected. In the direct photolysis, the effects of Xe, Kr, Ar, He, H2, and N2 as foreign gases were studied. Xe and Kr caused the intersystem crossing of NH and ND(c 1 π → A 3π) to occur. Electronic quenching of NH or ND(c 1π) was also observed for Xe, Kr, H2, and N2. The cross sections for intersystem crossing and quenching are presented. H2, N2, He, and Ar caused no intersystem crossing of NH and ND(c 1π). Neither He nor Ar quenched the emission from NH and ND(c 1π).