KINETICS OF THE REACTION F-]FNO+M STUDIED BY PULSE-RADIOLYSIS COMBINED WITH TIME-RESOLVED IR AND UV SPECTROSCOPY(NO+M)

The title reaction was initiated by pulse radiolysis of SF6/NO gas mix tures, 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 c m(-1). Comparative studies were carried out at pressures of 250-1000 m bar 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-of f curve with the following values of the limiting high- and low-pressu re 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 fac tor, F-cent = 0.878 at 298 K.