Simple model for hydrogen atom reactions in neopentane--cyclohexane mixtures irradiated at 4. 2 K
Journal Article
·
· J. Phys. Chem.; (United States)
In this paper, a simple model is given to explain why hydrogen atoms produced in crystalline neopentane at 77 K have a high probability of reacting with dilute solute molecules, whereas at 4.2 K they abstract hydrogen from neopentane matrix molecules. The model is based on the following assumptions: at 77 K hydrogen atoms which do not undergo short-range hot abstractions migrate until they encounter a solute molecule, and abstract hydrogen from it. At 4.2 K the hydrogen atoms which would be mobile at 77 K are immobilized at their place of birth and eventually abstract only from one of the molecules in the cage wall surrounding each hydrogen atom. The experimental data at 4.2 K are compared with estimates of the solute radical yields for different assumed values of (a) the fraction of hydrogen atoms which undergo short-range hot abstraction; (b) the ratio of the rate constants for the reaction of immobilized hydrogen atoms with a matrix and a solute molecule; and (c) the number of molecules in the cage wall. By this comparison plausible numerical values are obtained for each of these parameters. 3 figures.
- Research Organization:
- Government Industrial Research Inst., Nagoya, Japan
- OSTI ID:
- 6191800
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:12; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Thu Jun 14 00:00:00 EDT 1979
· J. Phys. Chem.; (United States)
·
OSTI ID:6036005
Effect of irradiation temperatures on hydrogen atom reactions in neopentane and its mixtures irradiated at 4. 2 and 77/sup 0/K as studied by electron spin resonance. [Gamma rays and x-rays]
Journal Article
·
Thu Jul 14 00:00:00 EDT 1977
· J. Phys. Chem.; (United States)
·
OSTI ID:7094684
ESR studies of irradiated methane and ethane at 4. 2 K and mechanism of pairwise trapping of radicals in irradiated alkanes
Journal Article
·
Wed Aug 15 00:00:00 EDT 1979
· J. Chem. Phys.; (United States)
·
OSTI ID:5938560
Related Subjects
2-2-DIMETHYLPROPANE
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKANES
ATOMIC MODELS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CRYOGENIC FLUIDS
CYCLOALKANES
CYCLOHEXANE
DECOMPOSITION
DISPERSIONS
ELEMENTS
FLUIDS
HYDROCARBONS
HYDROGEN
IRRADIATION
KINETICS
LOW TEMPERATURE
MATHEMATICAL MODELS
MATRIX MATERIALS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
REACTOR MATERIALS
ULTRALOW TEMPERATURE
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKANES
ATOMIC MODELS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CRYOGENIC FLUIDS
CYCLOALKANES
CYCLOHEXANE
DECOMPOSITION
DISPERSIONS
ELEMENTS
FLUIDS
HYDROCARBONS
HYDROGEN
IRRADIATION
KINETICS
LOW TEMPERATURE
MATHEMATICAL MODELS
MATRIX MATERIALS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
REACTOR MATERIALS
ULTRALOW TEMPERATURE