Tunable UV Laser Photolysis of NF2: Quantum Yield for NF(a1 delta) Production.

The ultraviolet photodissociation of difluoroamine NF2 has been investigated from 240 to 270 nm, using tunable UV radiation from a frequency-upconverted YAG pumped dye laser system. The absorption cross section of NF2 and the photolysis quantum yield for the fragment NFa1 delta were measured with 0.25cm resolution. The NFa1 delta quantum yield decreases at longer wavelengths and is only 1 at 260 nm. This suggests that the first long wavelength band in NF2 leads primarily to ground state NFX3 epsilon, an that the existence of a new higher lying NF2 electronic state is responsible for the NFa 1 delta production. Keywords Photodissociation, Photolysis, Quantum yield, Nitrogen difluoride.