Hydrogen abstraction reactions by atomic fluorine. V. Time-independent nonthermal rate constants for the /sup 18/F+H/sub 2/ and /sup 18/F+D/sub 2/ reactions

Journal Article · Thu Apr 15 04:00:00 EST 1976 · J. Chem. Phys.; (United States)

OSTI ID:7195447

Feng, D; Grant, E R; Root, J W

The general time-independent collision theory formulation for the bimolecular rate constant has been adapted for the description of hot atom systems. Two types of hot atom energy distribution functions have been considered in an application to the /sup 18/F+H/sub 2/ reaction system: (i) a delta-function distribution, and (ii) a steady-state Maxwellian distribution characterized by a hot atom temperature T/sub A/. From the time-independent solution of the Boltzmann equation together with microscopic reactive cross sections determined from quasiclassical trajectory computations, nonthermal /sup 18/F+D/sub 2/ processes. The results showed little sensitivity to the assumed shape of the hot atom energy distribution or to the magnitude of the barrier height along the reaction coordinate. The intermolecular kinetic isotope effect kappa/sub H/2/kappa/sub D/2 provided a sensitive probe of the average energy of hot reaction, suggesting an average /sup 18/F laboratory kinetic energy of 50 +- 10 eV for the /sup 18/F+H/sub 2/ process under nuclear recoil conditions. (AIP)

• Research Organization: Department of Chemistry, University of California, Davis, California 95616
• OSTI ID: 7195447
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 64:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
400701* -- Radiochemistry & Nuclear Chemistry-- Hot-Atom Chemistry
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHEMICAL REACTION KINETICS
CHEMISTRY
CRYOGENIC FLUIDS
DEUTERIUM
ELEMENTS
ENERGY
ENERGY SPECTRA
FLUIDS
FLUORINE 18
FLUORINE ISOTOPES
HOT ATOM CHEMISTRY
HOURS LIVING RADIOISOTOPES
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
KINETIC ENERGY
KINETICS
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RADIOCHEMISTRY
RADIOISOTOPES
REACTION KINETICS
RECOILS
SPECTRA
STABLE ISOTOPES