Use of hydrogen chloride as a probe for the determination of primary processes in acetaldehyde photolysis
The photolysis of acetaldehyde at 3000 A and 25 +/- 2/sup 0/C was studied in CH/sub 3/CHO-HCl and CH/sub 3/CHO-HCl-CO/sub 2/ mixtures. The formation of methane via the reaction CH/sub 3/ + HCl ..-->.. CH/sub 4/ + Cl and its pressure dependence were utilized for the evaluation of the low-pressure quantum yields of the primary photodissociation processes: CH/sub 3/CHO ..-->.. CH/sub 3/ + HCO (I); CH/sub 3/CHO ..-->.. CH/sub 4/ + CO (II); CH/sub 3/CHO ..-->.. CH/sub 3/CO + H (III). The values obtained for phi/sub I/, phi/sub II/, and phi/sub III/ of 0.92, 0.015, and 0.065, respectively, are in very good agreement with estimates based on CO and H/sub 2/ determination in mixtures of oxygen with acetaldehyde. These findings indicate that HCl can be used as a convenient and sensitive probe in studies aimed at the determination of the radical yields in the photolysis of acetaldehyde.
- Research Organization:
- Soreq Research Center, Yavne, Israel
- OSTI ID:
- 5333718
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:18; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photolysis of CH{sub 3}CHO at 248 nm: Evidence of triple fragmentation from primary quantum yield of CH{sub 3} and HCO radicals and H atoms
Dynamics of multidissociation paths of acetaldehyde photoexcited at 157 nm: Branching ratios, distributions of kinetic energy, and angular anisotropies of products
Related Subjects
400500* -- Photochemistry
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACETALDEHYDE
ALDEHYDES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EQUATIONS
EXPERIMENTAL DATA
INFORMATION
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PREDICTION EQUATIONS
PRESSURE DEPENDENCE
REACTION INTERMEDIATES