Correlation between the inhibition of positronium formation by scavenger molecules, and chemical reaction rate of electrons with these molecules in nonpolar liquids

Journal Article · Thu Mar 10 00:00:00 EST 1977 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100520a001· OSTI ID:7212736

Levay, B; Mogensen, O E

o-Ps yields were determined in various liquid hydrocarbons, tetramethylsilane, and mixtures thereof as a function of C/sub 2/H/sub 5/Br and CCl/sub 4/ concentration. These molecules are known to be good electron scavengers and positronium inhibitors as well. The spur reaction model of Ps formation predicts a correlation between the inhibition coefficient and the chemical rate constant of electrons with scavenger molecules. We found that the dependence of the inhibition coefficient on the work function (V/sub 0/) of electrons in different liquids shows a very unusual behavior, similar to that recently found for the chemical rate constants of quasifree electrons with the same scavenger molecules. The inhibition coefficient as a function of V/sub 0/ had a maximum for C/sub 2/H/sub 5/Br, while it increased monotonously with decreasing V/sub 0/ for CCl/sub 4/. The inhibition coefficient for C/sub 2/H/sub 5/Br in a 1 : 1 molar tetramethylsilane-n-tetradecane mixture was found to be greater than in both of the pure components. The clear correlation found between electron scavenging rate constants and positronium inhibition constitutes the severest test to date of the spur reaction model of positronium formation. The importance of the positron annihilation method from the point of view of radiation chemistry is also emphasized.

• Research Organization: Danish Atomic Energy Commission, Roskilde
• OSTI ID: 7212736
• Journal Information: J. Phys. Chem.; (United States), Vol. 81:5
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
2-2-DIMETHYLPROPANE
POSITRONIUM
HEXANE
HYDROCARBONS
OCTANE
INHIBITION
SILANES
BROMINATED ALIPHATIC HYDROCARBONS
CARBON TETRACHLORIDE
CHEMICAL REACTION KINETICS
LIFETIME
LIQUIDS
MIXTURES
MOLECULES
POSITRONS
SCAVENGING
ALKANES
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
CHLORINATED ALIPHATIC HYDROCARBONS
DISPERSIONS
ELEMENTARY PARTICLES
FERMIONS
FLUIDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDRIDES
HYDROGEN COMPOUNDS
KINETICS
LEPTONS
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
REACTION KINETICS
SILICON COMPOUNDS
640303* - Atomic
Molecular & Chemical Physics- Positronium
Muonium
& Muonic & Mesic Atoms & Molecules
400600 - Radiation Chemistry