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Quenching of CH2(b 1B1) by hydrocarbons

✍ Scribed by M. Castillejo; J.M. Figuera; I. Garcia-Moreno; J. Medina

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 452 KB
Volume: 157
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(89)87204-5

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✦ Synopsis

Rate constants for quenching of CH2 (6 'B, ) C( 0,14,0) by six hydrocarbons have been measured. 'B, methylene was prepared by a two-step process. In the first step ketene was photodissociated by a XeCl excimer laser yielding CH,(% 'A, ). Subsequently CH2( 'B, ) was populated by dye-laser absorption from the previously prepared 'A, state. Time-resolved fluorescence from the 'B, state was observed and the quenching with added gases and vapors studied. The measured quenching rate constants for linear hydrocarbons CzHs, CzH4 and CZH2 and cyclic C6HIZ, C6H10and C6H,are 5.3,&l, 9.5,7.5, lO.Oand 12.0 (in 10-'0cm3 molecule-' SK' ), respectively. The rate constants were found to increase with the degree of unsaturation of the carbon-carbon bond of the quencher and are all larger than the gas kinetic rate.

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