NDLI: Positron annihilation in free volume elements of polymer structures

Content Provider	Springer Nature Link
Author	Shantarovich, V.P. Goldanskii, V.I.
Copyright Year	1998
Abstract	Free volume effects are important for positronium formation, pick‐off annihilation and chemical reactions. In order to make the method of positron annihilation an effective technique for quantitative studies of molecular solids, for example polymers, the relation between the intensity of the long‐lived component of lifetime distribution of positron annihilation and the number of defects (elementary free volumes) was considered. The analysis assumes selective trapping of positrons and positronium in the defects of ordered and disordered (crystalline and amorphous) sites, respectively, the sizes of nonhomogeneities are assumed to be lower than positron diffusion length. The results on positronium annihilation in porous poly(phenylene oxide) allow one to estimate nontrapped positronium diffusion coefficient which is equal to $$$$ . The relation between the positronium lifetime and effective size of free volume for large pores (effective radius $$\geqslant $$ 1 nm) is considered. Experimental results were obtained using the CONTIN program; some comments on its application for calculations of size distribution of elementary free volumes in polymers are discussed.
Starting Page	67
Ending Page	81
Page Count	15
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	116
Issue Number	1-4
e-ISSN	15729540
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Surfaces and Interfaces, Thin Films Nuclear Physics, Heavy Ions, Hadrons Atoms, Molecules, Clusters and Plasmas Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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