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 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.
Yamasaki
Katsuyoshi
K
Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan. kyam@hiroshima-u.ac.jp
Fujii
Hidekazu
H
Watanabe
Shinji
S
Hatano
Takayuki
T
Tokue
Ikuo
I
D005453:Fluorescence; D005466:Fluorocarbons / Q000737:chemistry*; D007700:Kinetics; D007834:Lasers; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry*; D010782:Photolysis; D013050:Spectrometry, Fluorescence; D013816:Thermodynamics; D014732:Vibration
D005466:Fluorocarbons; C035066:carbon tetrafluoride; D010100:Oxygen