Photolysis of acetone at 193. 3 nm

Journal Article · Thu Aug 25 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100328a024· OSTI ID:5992772

Lightfoot, P D; Kirwan, S P; Pilling, M J

The photodecomposition of acetone by single-pulse excimer laser photolysis at 193 nm has been studied by using end product analysis and time-resolved absorption spectroscopy at 300 and 600 K and as a function of helium pressure. Ethane is the dominant product and the channel producing 2CH/sub 3/ + CO accounts for about 95% of the overall photolysis. It is suggested that the next most important channels produce H + CH/sub 2/COCH/sub 3/ (approx. 3%) and CH/sub 4/ + CH/sub 2/CO (/approx lt/ 2%). Time-resolved experiments failed to detect acetyl radicals on a approx. 1-ms time scale, demonstrating that their yield is < 1% of that of the methyl radical. The ethylene yield increases nonlinearly with laser energy, an observation attributed to secondary photolysis of vibrationally excited methyl radicals to yield CH/sub 2/ + H. The experiments demonstrate that 193-nm laser photolysis is a clean source of methyl radicals.

• Research Organization: Physical Chemistry Lab., Oxford (England)
• OSTI ID: 5992772
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:17; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
ACETONE
ALKANES
ALKYL RADICALS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ETHANE
EXCIMER LASERS
EXPERIMENTAL DATA
GAS LASERS
HYDROCARBONS
INFORMATION
KETONES
LASERS
MEDIUM TEMPERATURE
METHYL RADICALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
SPECTROSCOPY
TIME DEPENDENCE
YIELDS