Efficient vibrational relaxation of O2(X 3sigma(g)-, nu = 8) by collisions with CF4

A laser flash photolysis-laser-induced fluorescence (LIF) technique has been employed to study the relaxation kinetics of vibrationally excited O2(X 3sigma(g)-. The time-resolved LIF excited B 3sigma(u)(-)-X 3sigma(g)- system has been recorded and analyzed by the integrated-profiles method. The rate...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2006-04, Vol.8 (16), p.1936-1941
Main Authors: Yamasaki, Katsuyoshi, Fujii, Hidekazu, Watanabe, Shinji, Hatano, Takayuki, Tokue, Ikuo
Format: Article
Language:English
Subjects:
Fluorescence
Fluorocarbons - chemistry
Kinetics
Lasers
Models, Chemical
Oxygen - chemistry
Photolysis
Spectrometry, Fluorescence
Thermodynamics
Vibration
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Summary:A laser flash photolysis-laser-induced fluorescence (LIF) technique has been employed to study the relaxation kinetics of vibrationally excited O2(X 3sigma(g)-. The time-resolved LIF excited B 3sigma(u)(-)-X 3sigma(g)- system has been recorded and analyzed by the integrated-profiles method. The rate coefficient for vibrational relaxation of O2(X 3sigma(g)-, nu = 8) by collisions with CF(4), [1.4 +/- 0.3(2sigma)] x 10(-11) cm3 molecule(-1) s(-1), indicates that CF4 is an efficient relaxant of O2(X 3sigma(g)- and that the propensity rule for O2 relaxation suggested by Mack et al. (J. A. Mack, K. Mikulecky and A. M. Wodtke, J. Chem. Phys., 1996, 105, 4105) has been observed experimentally.
ISSN:1463-9076