Journal ArticleDOI
Annihilation of Positrons from Positronium Negative Ion e − e + e −
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This article is published in Physical Review.The article was published on 1968-06-05. It has received 49 citations till now. The article focuses on the topics: Positronium & Annihilation.read more
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The temperature dependence of positron lifetimes in solid pivalic acid
TL;DR: In this article, the temperature dependence of positron lifetimes in both the brittle and plastic phases of trimethylacetic (pivalic) acid was examined using the positron lifetime technique.
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Positron studies of condensed matter
TL;DR: In this article, a review of the use of the positron-electron annihilation phenomenon in the physics of condensed matter is presented, where the theory of the annihilation process is outlined, the importance of the two-photon mode of decay is established, and the observable results depend on the initial positron and electron states of the system.
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Free volume and transport properties in highly selective polymer membranes
TL;DR: In this article, the authors studied the correlation between free volume and transport properties of highly selective polymer membranes and found that the permeation properties are controlled not only by free volume fluctuations but also by energy barriers.
Journal ArticleDOI
Electron liquid in collective description. III. Positron annihilation
J. Arponen,E Pajanne +1 more
TL;DR: In this paper, the collective excitations of the electron system are represented by interacting bosons, which enables one to include in a logical way the most important terms of electron-electron interaction beyond the random-phase approximation (RPA).
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Free volume distributions in glassy polymer membranes : Comparison between molecular modeling and experiments
C. Nagel,E. Schmidtke,K. Günther-Schade,Dieter Hofmann,D. Fritsch,Thomas Strunskus,Franz Faupel +6 more
TL;DR: In this article, the authors compare molecular modeling results of two glassy polymer membranes and one rubbery polymer membrane with gas transport parameters and free-volume-related quantities from positronium annihilation.