Rate constant and products of the reaction between nitrogen trioxide and chlorine monoxide over the temperature range 353-210 K

Kinetic Studies of the Reaction between NO3and OClO atT= 300 K andP= 2−8 Torr

“…16 (2σ); that is, the channel of reaction 15 leading to ClOO formation is more likely than regeneration of OClO. This conclusion is in line with the results of Biggs et al 8 and Friedl et al, 1 rather than those of Becker et al 22 The results of the various studies are drawn together in Table 4.…”

“…A one-parameter fit with fixed at 0.8, the value previously measured in this laboratory, 8 yielded lower values of k 1a for all the entries in Table 3 with < 0.8. For example, for the final entry in the table, the one-parameter fit gave a value for k 1a of 2.4 × 10 -17 cm 3 molecule -1 s -1 , rather than 3.8 × 10 -17 cm 3 molecule -1 s -1 , which was obtained from the two-parameter fit.…”

“…8 Discharge Stopped-Flow (DSF) Experiments. Grade A, >99.9%), which entered the absorption cell or flow tube Via an oxygen-removing column (Oxisorb, Messer Griesheim).…”

“…7 However, the reaction might still be significant under nighttime stratospheric conditions. Discharge-flow experiments 8 yielded an upper limit for the rate constant of 10 -15 cm 3 molecule -1 s -1 , while a preliminary discharge stopped-flow study 9 suggested a value of 2 × 10 -16 cm 3 molecule -1 s -1 , assuming the reaction proceeded through the channel † Present address: Laboratoire OClO This paper concerns laboratory studies of the potentially significant direct reaction between the two species, Previous studies in this laboratory have indicated that the reaction is slow.…”

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume III – reactions of inorganic halogens

“…The results of are consistent with those of Biggs et al (1991) who reported that the rate coefficient is independent of temperature over the range 210 K to 353 K. The two direct measurements of the branching ratio k 2 /k, of 0.20±0.10 at 297 K (Biggs et al, 1991) and 0.32±0.1 at 300 K (Kukui et al, 1994), are in agreement that channel (1) dominates, and the preferred value of k 2 is based on the results of these two studies (Biggs et al, 1991;Kukui et al, 1994). From a study of the OClO-NO 3 system, Friedl et al (1992) conclude that at 220 K and 298 K the major reaction channel is channel (1), in agreement with the conclusions of , Biggs et al (1991) and Kukui et al (1994).…”