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Limitations of the moderated nuclear recoil technique for investigating thermal hydrogen abstraction reactions by atomic fluorine

Journal Article · · Adv. Chem. Ser.; (United States)
OSTI ID:6056362
; ; ; ;
A sensitive technique has been developed for characterizing the nonthermal H/sup 18/F yields formed from the dilute concentrations of hydrogen donors present in moderated nuclear recoil (MNR) /sup 18/F experiments. The relative nonthermal mean collisional reactivities of cyclopentane and of C/sub 1/-C/sub 6/ alkanes present in excess C/sub 2/F/sub 6/ have been measured using this method. The nonthermal reactivities per carbon-hydrogen bond in these substances exhibit +-10% maximum variations about the constant average value that is characteristic of unbranched C/sub 2/-C/sub 6/ alkanes. The MNR method can be utilized for the investigation at enhanced sensitivity of thermal hydrogen abstraction reactions by atomic /sup 18/F. Quantitative relative-to-absolute scaling relationships have been used for the estimation of absolute rate constants for many such reactions. The advantages, limitations, and physical basis of the MNR technique are considered.
Research Organization:
Univ. of California, Davis
DOE Contract Number:
AM03-76SF00034; AT03-76ER70158
OSTI ID:
6056362
Journal Information:
Adv. Chem. Ser.; (United States), Journal Name: Adv. Chem. Ser.; (United States) Vol. 197; ISSN ADCSA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400302 -- Organic Chemistry-- Isotope Effects-- (-1987)
400701* -- Radiochemistry & Nuclear Chemistry-- Hot-Atom Chemistry
ALKANES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BUTANE
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE
CYCLOALKANES
DATA
DEHYDROGENATION
DEUTERIUM
ELEMENTS
ETHANE
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE 18
FLUORINE ISOTOPES
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENS
HEXANE
HOT ATOM CHEMISTRY
HOURS LIVING RADIOISOTOPES
HYDROCARBONS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
METHANE
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PENTANE
PRESSURE DEPENDENCE
PROPANE
RADIOCHEMISTRY
RADIOISOTOPES
RECOILS
SCAVENGING
STABLE ISOTOPES