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Kinetic studies on state-state coupling and collisional quenching of excited sulfur dioxide

✍ Scribed by Qun Zhang; Congxiang Chen; Shuqin Yu; Xingxiao Ma

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
155 KB
Volume
30
Category
Article
ISSN
0538-8066

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✦ Synopsis

The time-resolved total emission of SO 2 at were moni-1 1 (B B : X A ) 354.9 nm 1 1 tored following the direct excitation by a laser pulse. A three-level model was proposed 266 nm to deal with SO 2 (X 1 A 1 , A 1 A 2 , B 1 B 1 ) system. From a kinetic treatment of these measurements, the coupling coefficient, , and the relaxation time, , relating to the high vibronic levels of A 1 A 2 and B 1 B 1 states were first obtained. It is found that and values keep basically constant, reflecting the characteristics of the studied system. In addition, the quenching rate constants of SO 2 (A 1 A 2 , B 1 B 1 ) by some alkane and chloromethane molecules were measured at room temperature. The formation cross sections of complexes of SO 2 (A 1 A 2 , B 1 B 1 ) and quenchers were calculated by means of a collision complex model. It is shown that the dependence of the formation cross section of complex on the number of C9 H or C9Cl bonds is generally in agreement with that of the measured quenching cross section.

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