名称:
The 193 (and 248) nm photolysis of HN3: Formation and internal energy distributions of the NH (a 1Δ, b 1∑+, A 3Π, and c 1Π) states
摘要:
The UV photolysis of HN3 at 193 nm was investigated in detail in the bulk phase at 300 K. NH radicals in the X, a, b, A, and c states were found to be formed with quantum yields ≤0.0019, 0.4, 0.017, 0.000 15, and 0.000 61, respectively. Relative rotational and vibrational populations were measured for all states except for NH(X). Average translational energies were estimated for NH(a,v=0 and 1) and NH(b,v=0). The 248 nm photolysis of HN3 was reinvestigated with respect to processes forming NH radicals other than NH(a). The observed energy distributions differ for both laser wavelengths and for high and low lying NH states. The distribution can be better described by a simple impulsive than by a statistical model. Some conclusions are drawn concerning the upper HN3 potential surfaces involved.