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Collisional quenching of CH(A 2Δ) at 300 K by O2, alkane, chloromethane and CS2 molecules

✍ Scribed by Congxiang Chen; Xuejun Wang; Shuqin Yu; Qingzheng Lu; Xingxiao Ma

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
461 KB
Volume
197
Category
Article
ISSN
0009-2614

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✦ Synopsis

Rate constants for the quenching of CH(A 'A, v'=O) by OS, cyclc~-C~H,~, n-CSH,2, n-&Hid, n-C7H,6, CH&, CHClp, CC& and CS2 molecules were measured by using the direct time-resolved technique. CH(A 'A) was produced by 266 nm ultraviolet laser photolysis and the time-resolved emission of CH(A 'A-*X 'II) was then monitored as a function of time using a fast digital storage oscilloscope coupled with a microcomputer. For the partner molecule 02, the quenching rate constant is consistent with previous measurements. For alkane molecules, the quenching rate constants increase approximately in proportion to the number of C-H bonds in the alkane. The results for chloromethane molecules are interpreted using a collision complex model. For the collision partner CSI, CH (A 'A) is more reactive than CH (X %).

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