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Positron Annihilation Spectroscopies in Condensed Matter
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Positron Annihilation Spectroscopies in Condensed Matter

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Macromolecules".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 746

Special Issue Editors

Dr. Giovanni Consolati

E-Mail Website
Guest Editor
Department of Aerospace Science and Technology, Politecnico di Milano, Via La Masa 34, Milano, Italy
Interests: glass transition; irradiation effects; amorphous polymers; differential scanning calorimetry; X-ray powder diffraction; positron annihilation; free volume
Prof. Dr. Chunqing He

E-Mail Website1 Website2
Guest Editor
Key Laboratory of Nuclear Solid-State Physics Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China
Interests: positron annihilation; defects; free volumes; pores; membranes; thin films; polymers; fuel cells; supercapacitors; metal-organic frameworks (MOFs); porous materials

Special Issue Information

Dear Colleagues, 

The search for new materials with good performance that are also sustainable for the environment requires a suitable combination of advanced methods to understand their structural features, from macro- to nanoscales. Among the techniques able to supply information about the properties of a material at an atomic level, positron annihilation offers several advantages: it is non-destructive and is able to detect sub-nanometric cavities, such as vacancies in metals, voids in porous materials, and free volume holes in polymers. Furthermore, using a beam of monoenergetic positrons, it is possible to explore different subsurface layers of material.

The aim of this Special Issue is to collect reviews as well as original research articles on this technique, showing its capability to potentially investigate any kind of material, from metals to semiconductors and non-metallic systems.

Dr. Giovanni Consolati
Prof. Dr. Chunqing He
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • defects
  • Doppler broadening of the annihilation radiation lineshape
  • free volume
  • porous materials
  • positron annihilation lifetime spectroscopy
  • vacancy
  • vacancy clusters

Published Papers (1 paper)

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Review

25 pages, 689 KiB  
Review
Modelling Annihilation Properties of Positronium Confined in Nanoporous Materials: A Review
by Fabrizio Castelli and Giovanni Consolati
Int. J. Mol. Sci. 2024, 25(7), 3692; https://doi.org/10.3390/ijms25073692 - 26 Mar 2024
Viewed by 521
Abstract
Positronium (Ps) is a valuable probe to investigate nanometric or sub-nanometric cavities in non-metallic materials, where Ps can be confined. Accessible experimental measurements concern the lifetime of trapped Ps, which is largely influenced by pick-off processes, depending on the size of the cavity [...] Read more.
Positronium (Ps) is a valuable probe to investigate nanometric or sub-nanometric cavities in non-metallic materials, where Ps can be confined. Accessible experimental measurements concern the lifetime of trapped Ps, which is largely influenced by pick-off processes, depending on the size of the cavity as well as on the density of the electrons belonging to the surface of the host trap. Another relevant physical quantity is the contact density, that is the electron density at the positron position, which is usually found to be well below the vacuum value. Here, we review the principal models that have been formulated to account and explain for these physical properties of confined Ps. Starting with models, treating Ps as a single particle formulated essentially to study pick-off, we go on to describe more refined two-particle models because a two-body model is the simplest approach able to describe any change in the contact density, observed in many materials. Finally, we consider a theory of Ps annihilation in nanometric voids in which the exchange correlations between the electron of Ps and the outer electrons play a fundamental role. This theory is not usually taken into account in the literature, but it has to be considered for a correct theory of pick-off annihilation processes. Full article
(This article belongs to the Special Issue Positron Annihilation Spectroscopies in Condensed Matter)
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