A method is described for the phot~le~c me~~ment of the time-resolved atomic absorption by electronically excited iodine atoms, 1(5'Prn), generated by pulsed irradiation-A kinetic investigation of the decay of these excited atoms yields a vaIlle for the quenching rate constant by mo?ecuku oxygen, th
Relative yields of electronically excited iodine atoms, I(5 2P12), in the photolysis of alkyl iodides
β Scribed by T. Donohue; J.R. Wiesenfeld
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 509 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The fraction of electronically excited iodine atoms, I(5 2P,/&, formed in the broadband flash photolysis of several alkyl iodides has been determined using time-resolved static absorption spectroscopy. By monitoring the temporal proftie of the ground state, I(5 *Pa/z), following the photolytic pulse, the initial yields of ground and electronically excited atoms may be obtained. Deactivation rates of I(5 *PI/~) by these alkyl iodides are also reported.
π SIMILAR VOLUMES
Excited iodine atoms :(\*PI/~) are formed by laser irradiation of C2FS I at 2950 A. The mczm radiative lifetime T of these metastsble atoms and their bimolecular rate constant k2 for deactivation in collisions with C2 F5 I were measured to be: T = 108 +-10 ms; k2 = (1.8 i 0.1) X 10-l' cm3/molec s. \
## Based on competitive reactions and 1 H NMR measurements, it was found that (EtO) 2 P(O)CH 2 I is at least 2-3 orders of magnitude less reactive than other non-phosphorus iodides of the EWG-CH 2 I type (EWG = NC, COOMe, 4-Br-C 6 H 4 CO). MeSCH 2 I turned out to be totally unreactive in the title