Abstract
A technique is described in which photolysis is effected by a sequence of light pulses. It is shown that if a single train of pulses is employed with accurately known (variable) pulsing frequency, and if the light absorbed per pulse is measured, it is possible to obtain absolute rate constants for competing radical-abstraction reactions and dimerization reactions. First results from this method, applied to the photolysis of acetone, lead to mean rate constants at 134 °C of
k
2
= 2.3 x 10
13
ml. mole
-1
s
-1
for 2CH
3
-> C
2
H
6
and
k
3
= 2.0 x 10
6
ml. mole
-1
s
-1
for CH
3
+ CH
3
COCH
3
-> CH
4
+ CH
2
COCH
3
. A second mode of operation, employing a sequence of pairs of light pulses with variable time delay between members of the pair, is also discussed, in relation to the measurement of rate constants and to the detection of reaction among 'hot’ radicals.
Reference16 articles.
1. Benson S. W. i960 Foundations of chemical kinetics pp. 392-400. New Y ork: McGraw-Hill Book Co.
2. Proc. Roy;Bradley J .;Soc. A,1956
3. Briers F . Chapm an D. L. & W alters E. 1926 Chem. Soc. p. 562.
4. Dickinson R . G. 1935 See Noyes W. A. J r. & Leighton P. A. 1941 The photochemistry of gases pp. 202-209. New Y ork: R einhold Publ. Corp.
5. J;Gomer R .;Chem. Phys.,1950
Cited by
24 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献