Microscopic diffusion model for calculating orthopositronium lifetimes in micellar solutions
A microscopic diffusion model was formulated to describe the orthopositronium (o-Ps) lifetime density function in micellar solutions with the following main assumptions: the o-Ps lifetime in the solvent is different from that in the micelles; o-Ps and micelles diffuse in the solvent; the low atomic density region of the micellar boundary serves as an effective o-Ps trap. A nonexponential o-Ps lifetime density function has been derived by approximately solving an o-Ps diffusion problem with randomly distributed spherical absorbers. The parameters of the function are the formation and annihilation probabilities of o-Ps in the solvent and in the micellar pseudo-phase, the diffusion coefficients of o-Ps and the micelles in the solvent, as well as the structural data of the micellar solution, viz. the surfactant concentration and the micellar aggregation number and radius. 44 references, 6 figures.
- Research Organization:
- Central Research Institute for Physics, Budapest, Hungary
- OSTI ID:
- 5880824
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:6; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
640303* -- Atomic
Molecular & Chemical Physics-- Positronium
Muonium
& Muonic & Mesic Atoms & Molecules
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METAL COMPLEXES
CARBOXYLIC ACIDS
COMPLEXES
COMPUTERIZED SIMULATION
DATA
DIFFUSION
DODECANOIC ACID
HEAVY WATER
HYDROGEN COMPOUNDS
INFORMATION
LIFETIME
MECHANICS
MICELLAR SYSTEMS
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POSITRONIUM
POSITRONIUM CHEMISTRY
PROBABILITY
QUANTUM MECHANICS
SIMULATION
SODIUM COMPLEXES
SOLVENT PROPERTIES
SULFATES
SULFUR COMPOUNDS
THEORETICAL DATA
WATER