Kinetics of the reaction F+NO+M->FNO+M studied by pulse radiolysis combined with time-resolved IR and UV spectroscopy

The title reaction was initiated by pulse radiolysis of SF6/NO gas mixtures, and the formation of FNO was studied by time-resolved IR and UV spectroscopy. At SF6 pressures of 10-320 mbar at 298 K, the formation of FNO was studied by infrared diode laser spectroscopy at 1857.324 cm(-1). Comparative studies were carried out at pressures of 250-1000 mbar SF6 and temperatures of 298 and 341 K, where the formation of FNO was studied by monitoring the transient absorption of FNO at 310.5 nm.

The observed pressure dependence is represented in terms of a fall-off curve with the following values of the limiting high- and low-pressure rate coefficients, k(rec,infinity) = (2.5 +/- 0.8) x 10(10) M(-1) s(-1) and k(rec,0)/[SF6] = (1.5 +/- 0.3) x 10(11) x (T/300)(-1.0) M(-2) s(-1) in the temperature range 200-400 K, and with the broadening factor, F-cent = 0.878 at 298 K.