Rate constant measurements of reactions of C/sub 2/H with H/sub 2/, O/sub 2/, C/sub 2/H/sub 2/, and NO using color center laser kinetic spectroscopy
The rate constants for the reactions of the ethynyl radical (C/sub 2/H) with H/sub 2/, O/sub 2/, C/sub 2/H/sub 2/, and NO have been measured by following the time decay of an C/sub 2/H infrared transient absorption line originating from the ground vibronic state using color center laser spectroscopy. For the H/sub 2/, O/sub 2/, and NO reactions, the C/sub 2/H was produced by excimer laser flash photolysis (ArF, 193 nm) of CF/sub 3/C/sub 2/H. In the case of the C/sub 2/H/sub 2/ reaction C/sub 2/H was produced by flash photolysis of acetylene again using the 193-nm ArF excimer line. Excited states of C/sub 2/H, which are abundant with 193-nm photolysis, were relaxed by buffering the photolysis cell with approx. 20 Torr of He buffer and approx. 160 mTorr of SF/sub 6/. Rate constants of 4.2 x 10/sup -11/, 4.8 x 10/sup -13/, 1.5 x 10/sup -10/, and 3.5 x 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/ were obtained for the reactions of C/sub 2/H with O/sub 2/, H/sub 2/, C/sub 2/H/sub 2/, and NO, respectively.
- Research Organization:
- Rice Univ., Houston, TX
- DOE Contract Number:
- FG05-85ER13439
- OSTI ID:
- 5795237
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:22; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
ACETYLENE
ALKYL RADICALS
ALKYNES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
EXCIMER LASERS
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
GAS LASERS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
HYDROGEN
INFORMATION
INFRARED RADIATION
KINETICS
LASERS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
RADICALS
REACTION KINETICS
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