Rate constant measurements of C sub 2 H with CH sub 4 , C sub 2 H sub 6 , C sub 2 H sub 4 , D sub 2 , and CO

Journal Article · Thu Oct 04 00:00:00 EDT 1990 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100383a003· OSTI ID:5477949

Lander, D R; Unfried, K G; Glass, G P; Curl, R F ^[1]

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1. Rice Univ., Houston, TX (USA)

The rate constants for the reactions of the ethynyl radical (C{sub 2}H) with CH{sub 4}, C{sub 2}H{sub 6}, C{sub 2}H{sub 4}, D{sub 2}, and CO have been determined by following the time decay of a C{sub 2}H infrared transient absorption line originating from the ground vibronic state using diode laser spectroscopy. The C{sub 2}H was created by excimer laser flash photolysis (ArF, 193 nm) of CF{sub 3}CCH. Relaxation of excited states of C{sub 2}H was achieved by buffering the photolysis cell with {approx}20 Torr of He buffer and {approx}130 mTorr of SF{sub 6}. When possible, the dependence of the reaction rate on helium pressure was investigated over the range of 8-70 Torr. Second-order rate constants of 3.0 (2) {times} 10{sup {minus}12}, 1.3 (3) {times} 10{sup {minus}10}, 3.6 (2) {times} 10{sup {minus}11}, 2.3 (3) {times} 10{sup {minus}13} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} were obtained for the reactions of C{sub 2}H with CH{sub 4}, C{sub 2}H{sub 4}, C{sub 2}H{sub 6}, and D{sub 2}, respectively.

• OSTI ID: 5477949
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 94:20; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACETYL RADICALS
REACTION KINETICS
CARBON DIOXIDE
COMBUSTION PRODUCTS
ETHANE
LASER SPECTROSCOPY
MEASURING METHODS
METHANE
ACYL RADICALS
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
HYDROCARBONS
KINETICS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
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