Ir. Sims et al., ULTRA-LOW TEMPERATURE KINETICS OF NEUTRAL-NEUTRAL REACTIONS - NEW EXPERIMENTAL AND THEORETICAL RESULTS FOR OH-K AND 23-K(HBR BETWEEN 295), The Journal of chemical physics, 101(2), 1994, pp. 1748-1751
The first determination of the rate of reaction of OH radicals with HB
r at temperatures below 249 K is reported. Rate constants measured fro
m 295 to 23 K increase monotonically with decrease in temperature and
are faster than has previously been thought at the temperatures presen
t in the mid and low stratosphere. The observed negative temperature d
ependence is well predicted by a simple formula deduced from quantum s
cattering calculations employing the rotating bond approximation.