CAN POSITRON-ANNIHILATION LIFETIME SPECTROSCOPY MEASURE THE FREE-VOLUME HOLE SIZE DISTRIBUTION IN AMORPHOUS POLYMERS

Authors
YU Z MCGERVEY JD JAMIESON AM SIMHA R
Citation
Z. Yu et al., CAN POSITRON-ANNIHILATION LIFETIME SPECTROSCOPY MEASURE THE FREE-VOLUME HOLE SIZE DISTRIBUTION IN AMORPHOUS POLYMERS, Macromolecules, 28(18), 1995, pp. 6268-6272
Citations number
25
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecules → ACNP
ISSN journal
00249297
Volume
28
Issue
18
Year of publication
1995
Pages
6268 - 6272
Database
ISI
SICI code
0024-9297(1995)28:18<6268:CPLSMT>2.0.ZU;2-T
Abstract
We discuss the theoretical basis for relating the mean ortho-positroni um (o-Ps) lifetime to free-volume hole sizes using a finite spherical potential well model. The status of the localized o-Ps atom in amorpho us polymers is evaluated by calculation of the o-Ps barrier transmissi on probability. The results indicate that the relative probability for an o-Ps atom to remain in a particular hole during its entire lifetim e is on the order of 10(-2). We conclude that there is no justificatio n for a one-to-one correlation of o-Ps lifetime components with specif ic hole sizes.