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Title: 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

Abstract

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.

Authors:
; ; ;  [1]
  1. Rice Univ., Houston, TX (USA)
Publication Date:
OSTI Identifier:
5477949
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry; (United States)
Additional Journal Information:
Journal Volume: 94:20; Journal ID: ISSN 0022-3654
Country of Publication:
United States
Language:
English
Subject:
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; SPECTROSCOPY; 400800* - Combustion, Pyrolysis, & High-Temperature Chemistry; 400201 - Chemical & Physicochemical Properties

Citation Formats

Lander, D R, Unfried, K G, Glass, G P, and Curl, R F. 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. United States: N. p., 1990. Web. doi:10.1021/j100383a003.
Lander, D R, Unfried, K G, Glass, G P, & Curl, R F. 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. United States. https://doi.org/10.1021/j100383a003
Lander, D R, Unfried, K G, Glass, G P, and Curl, R F. Thu . "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". United States. https://doi.org/10.1021/j100383a003.
@article{osti_5477949,
title = {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},
author = {Lander, D R and Unfried, K G and Glass, G P and Curl, R F},
abstractNote = {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.},
doi = {10.1021/j100383a003},
url = {https://www.osti.gov/biblio/5477949}, journal = {Journal of Physical Chemistry; (United States)},
issn = {0022-3654},
number = ,
volume = 94:20,
place = {United States},
year = {1990},
month = {10}
}