Positronium Thermalization Process in Nanoporous Materials and its Influence on the Shape of PALS Spectrum |
| Journal |
Materials Science Forum (Volume 607) |
| Volume |
Positron and Positronium Chemistry |
| Edited by |
S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean |
| Pages |
39-41 |
| DOI |
10.4028/www.scientific.net/MSF.607.39 |
| Online since |
November, 2008 |
| Authors |
Jerzy Kansy,
Radosław Zaleski
|
| Keywords |
Nanoporous Materials, PALS Spectrum, Porosimetry, Positron Annihilation |
| 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. |
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