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Collisional processes in the O2 B 3Σu− state

✍ Scribed by Volker Sick; Michael Decker; Johannes Heinze; Winfried Stricker

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
339 KB
Volume
249
Category
Article
ISSN
0009-2614

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✦ Synopsis

Collisional processes, which influence quantitative laser-induced fluorescence (LIF) measurements involving the B 3"Y u state of molecular oxygen, were investigated. Since the B state is strongly predissociating, these processes are thought to be important only at higher pressures. However, we found that in LIF experiments in methane/air flames in the pressure range between atmospheric pressure and 40 bar collisional quenching and rotational energy transfer (RET) are important even at moderate pressures. Total quenching cross sections of 30(+ 10) ,~2 for v' = 2 and 100(+30) ,~2 for v' = 0 and total RET cross sections of 40(+ 16) ,~2 were found. An upper limit of 0.7 ,~2 for the cross section for vibrational energy transfer (VET) out of v' = 2 could he determined.

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