Ir. Sims et al., ULTRA-LOW TEMPERATURE KINETICS OF NEUTRAL-NEUTRAL REACTIONS - RATE CONSTANTS FOR THE REACTIONS OF OH RADICALS WITH BUTENES BETWEEN 295-K AND 23-K, Journal of the Chemical Society. Faraday transactions, 90(11), 1994, pp. 1473-1478
Citations number
37
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
The first experiments on the kinetics of reactions of the OH radical a
t temperatures below 80 K are reported. They have been carried out by
applying the pulsed laser photolysis (PLP), laser-induced fluorescence
(LIF) technique for studying the kinetics of free radical reactions i
n the ultra-cold environment provided by the gas flow in a CRESU (Cine
tique de Reaction en Ecoulement Supersonique Uniforme) apparatus. This
method has yielded rate constants for the reactions of OH with but-1-
ene, (Z)-but-2-ene and (E)-but-2-ene at temperatures down to 23 K. The
rate constants for all three reactions increase monotonically as the
temperature is lowered and this dependence of the rate constants on te
mperature can be fitted to an empirical expression of the form (k/10(-
10) cm3 molecule-1 s-1) = a exp[b(T/298 K)] with a and b equal to 5.2
and -2.8 for but-1-ene, 4.7 and -2.1 for (Z)-but-2-ene and 5.4 and -2.
1 for (E)-but-2-ene.