Competitive radiotracer evaluation of relative rate constants at stratospheric temperatures for reactions of /sup 38/Cl with CH/sub 4/ and C/sub 2/H/sub 6/ vs. CH/sub 2/=CHBr. [243/sup 0/ to 361/sup 0/K]
A radiotracer method has been applied to the study of the competitive reactions of /sup 38/Cl with a hydrocarbon (methane, ethane) vs. reaction with vinyl bromide, using /sup 38/Cl atoms formed in situ by irradiation of gaseous CClF/sub 3/ with thermal neutrons from a nuclear reactor. Variation of the ambient temperature of the samples during irradiation between 243 and 361/sup 0/K has permitted evaluation of the relative activation energies and relative rate constants for the reactions with the two gaseous hydrocarbons, and could be readily applied to other hydrogen-containing compounds. The data indicate a rate constant for k/sub 1/ at 243/sup 0/K of 3.2 +- 0.6) x 10/sup -14/ cm/sup 3/ molecule/sup -1/ s/sup -1/, in agreement with the lower limits of values considered in the past several years.
- Research Organization:
- Univ. of California, Irvine, CA (United States)
- OSTI ID:
- 7227942
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 81:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
BROMINATED ALIPHATIC HYDROCARBONS
CHEMICAL REACTION KINETICS
CHLORINE
CHLORINE 38
HOT ATOM CHEMISTRY
ETHANE
METHANE
ACTIVATION ENERGY
LOW TEMPERATURE
MEDIUM TEMPERATURE
OZONE
STRATOSPHERE
TEMPERATURE DEPENDENCE
TRACER TECHNIQUES
ALKANES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMISTRY
CHLORINE ISOTOPES
CRYOGENIC FLUIDS
EARTH ATMOSPHERE
ELEMENTS
ENERGY
FLUIDS
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENS
HYDROCARBONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LIGHT NUCLEI
MINUTES LIVING RADIOISOTOPES
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RADIOCHEMISTRY
RADIOISOTOPES
REACTION KINETICS
SECONDS LIVING RADIOISOTOPES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
500101 - Environment
Atmospheric- Basic Studies- Radiometric Techniques- (-1989)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
400701 - Radiochemistry & Nuclear Chemistry- Hot-Atom Chemistry