Positronium Thermalization Process in Nanoporous Materials and its Influence on the Shape of PALS Spectrum

Jerzy Kansy; Radosław Zaleski

doi:10.4028/www.scientific.net/MSF.607.39

Paper Titles

Positronium Molecule Formation on Al (111)^a
p.22

Dipositronium and other Two-Positronium Compounds
p.25

Ortho-Positronium Reemission Yield and Energy in Surfactant-Templated Mesoporous Silica Films
p.30

Collisions Involving Positrons and Positronium
p.34

Positronium Thermalization Process in Nanoporous Materials and its Influence on the Shape of PALS Spectrum
p.39

S-Wave Resonances in Positron Scattering from Li and Na
p.42

Positronium in Alkanes at High Pressure of Argon and Nitrogen
p.45

A Phenomenological Description of the PALS Response in Glass - Forming Systems
p.48

Momentum Distributions of Ortho-Positronium Dependent on Electronic State at Free Volume Walls in Insulators
p.53

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Positronium Thermalization Process in Nanoporous Materials and its Influence on the Shape of PALS Spectrum

Abstract:

A new method of analysis of PALS spectra of porous materials is proposed. The model considers both the thermalization process of positronium inside the pores and the pore size distribution. The new model is fitted to spectra of mesoporous silica MCM-41 and MSF. The resulting parameters are compared with parameters obtained from fitting the “conventional” models, i.e. a sum of exponential components with discrete or/and distributed lifetimes.