Direct rate measurements of the combination and disproportionation of vinyl radicals
Journal Article
·
· Journal of Physical Chemistry; (USA)
- National Institute of Standards and Technology, Gaithersburg, MD (USA)
- Dept. of Energy, Washington, DC (USA)
The rates of removal of vinyl radicals (C{sub 2}H{sub 3}) by means of combinations and disproportionation reactions have been directly measured at room temperature. Vacuum-ultraviolet (vacuum-UV) flash photolysis of divinylmercury was used to generate vinyl radicals, and vacuum-UV absorption kinetic spectroscopy was used to monitor the time history of vinyl radicals through their absorption at 1647.1 {angstrom}. The absolute rate constant for vinyl radical decay was determined to be 1.0 {times} 10{sup {minus}10} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. A ratio of 4.7 for the combination/disproportionation rate constants was measured by gas chromatographic analysis of the final reaction products. Absorption coefficients for the vinyl radical absorption in the 1,650-{angstrom} region were redetermined. The absolute rate constants for combination and disproportionation are then 8.2 {times} 10{sup {minus}11} and 1.8 {times} 10{sup {minus}11} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}, respectively.
- OSTI ID:
- 6879226
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:2; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ultraviolet absorption of the vinyl radical and reaction with oxygen
Atmospheric chemistry of trimethoxymethane, (CH{sub 3}O){sub 3}CH: Laboratory studies
Atmospheric chemistry of FO[sub 2] radicals. Reaction with Ch[sub 4], O[sub 3], NO, NO[sub 2], and CO at 295 K
Journal Article
·
Wed Dec 28 23:00:00 EST 1988
· J. Phys. Chem.; (United States)
·
OSTI ID:6186567
Atmospheric chemistry of trimethoxymethane, (CH{sub 3}O){sub 3}CH: Laboratory studies
Journal Article
·
Thu Apr 15 00:00:00 EDT 1999
· Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory
·
OSTI ID:343684
Atmospheric chemistry of FO[sub 2] radicals. Reaction with Ch[sub 4], O[sub 3], NO, NO[sub 2], and CO at 295 K
Journal Article
·
Thu Jul 07 00:00:00 EDT 1994
· Journal of Physical Chemistry; (United States)
·
OSTI ID:7204018
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ALKYL RADICALS
ATMOSPHERIC CHEMISTRY
CHEMICAL REACTIONS
CHEMISTRY
COMBUSTION PRODUCTS
DATA
DATA ANALYSIS
DECAY
DECOMPOSITION
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MERCURY COMPOUNDS
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
VINYL RADICALS
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ALKYL RADICALS
ATMOSPHERIC CHEMISTRY
CHEMICAL REACTIONS
CHEMISTRY
COMBUSTION PRODUCTS
DATA
DATA ANALYSIS
DECAY
DECOMPOSITION
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MERCURY COMPOUNDS
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
VINYL RADICALS