Absolute rate coefficients for methyl radical reactions by laser photolysis, time-resolved infrared chemiluminescence: CD3 + HX → CD3H + X(X = Br, I)
Description
Absolute rate coefficients are reported for the room temperature reactions of deuterated methyl radicals with HI and HBr, CD3 + HI (HBr) → CD3H + I(Br). Excimer laser photolysis of CD3I is used to generate methyl radicals, and time-resolved infrared chemiluminescence from the CH stretch of the CD3H products is detected to follow the time evolution of the reaction. The rate constants obtained in this manner are (7.7 +/- 0.7) x 10-12 cm3 molecule-1 s-1 for CD3 + HI and (4.7 +/- 0.4) x 10-12 cm3 molecule-1 s-1 for CD3 + HBr. These rate constants are considerably greater than earlier, indirectly measured values and indicate that the activation energy for these light-atom transfer reactions is lower than previously believed. 53 references, 3 figures, 2 tables
Additional details
Publishing Information
- Journal Title
- J. Phys. Chem.
- Journal Volume
- 90
- Journal Issue
- 5
- Series
- J. Phys. Chem.
- Journal Page Range
- 936-941
- ISSN
- 0022-3654
- CODEN
- JPCHA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 17067570
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ACTIVATION ENERGY; CHEMICAL PREPARATION; CHEMICAL REACTION KINETICS; DEUTERIUM COMPOUNDS; EXPERIMENTAL DATA; HYDRIODIC ACID; HYDROBROMIC ACID; ISOTOPE EFFECTS; ISOTOPE ENRICHED MATERIALS; METHANE; METHYL RADICALS; ORGANIC IODINE COMPOUNDS; PHOTOCHEMISTRY; PHOTOLYSIS
- Descriptors DEC
- ALKANES; ALKYL RADICALS; BROMINE COMPOUNDS; CHEMICAL REACTIONS; CHEMISTRY; DATA; DECOMPOSITION; ENERGY; HALOGEN COMPOUNDS; HYDROCARBONS; HYDROGEN COMPOUNDS; INFORMATION; INORGANIC ACIDS; INORGANIC COMPOUNDS; IODINE COMPOUNDS; KINETICS; MATERIALS; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; RADICALS; REACTION KINETICS; SYNTHESIS