Swelling of positronium confined in a small cavity.

Swelling of positronium confined in a small cavity.

The electron density at the positron (contact density) in the ground state positronium (Ps) formed in condensed matter is generally found to be lower than in vacuum. This is usually attributed to microscopic electric fields which polarize Ps, by acting on the two particles of the atom. In this paper...

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Main Authors: Giovanni Consolati, Fiorenza Quasso, Davide Trezzi
Format: Article
Language:English
Published: Public Library of Science (PLoS) 2014-01-01
Series:PLoS ONE
Online Access:http://europepmc.org/articles/PMC4196961?pdf=render
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spelling doaj-9780ab80dfc3421b99961055ae4f47892020-11-25T01:20:48ZengPublic Library of Science (PLoS)PLoS ONE1932-62032014-01-01910e10993710.1371/journal.pone.0109937Swelling of positronium confined in a small cavity.Giovanni ConsolatiFiorenza QuassoDavide TrezziThe electron density at the positron (contact density) in the ground state positronium (Ps) formed in condensed matter is generally found to be lower than in vacuum. This is usually attributed to microscopic electric fields which polarize Ps, by acting on the two particles of the atom. In this paper we quantitatively investigate an opposite effect. It is due to the confinement of Ps in small cavities existing in the host solid (e.g. free volume in polymers), which increases the contact density. Although this phenomenon is greater, the smaller is the size of the cavity, Ps polarization seems to play anyway a predominant role.http://europepmc.org/articles/PMC4196961?pdf=render
collection DOAJ
language English
format Article
sources DOAJ
author Giovanni Consolati
Fiorenza Quasso
Davide Trezzi
spellingShingle Giovanni Consolati
Fiorenza Quasso
Davide Trezzi
Swelling of positronium confined in a small cavity.
PLoS ONE
author_facet Giovanni Consolati
Fiorenza Quasso
Davide Trezzi
author_sort Giovanni Consolati
title Swelling of positronium confined in a small cavity.
title_short Swelling of positronium confined in a small cavity.
title_full Swelling of positronium confined in a small cavity.
title_fullStr Swelling of positronium confined in a small cavity.
title_full_unstemmed Swelling of positronium confined in a small cavity.
title_sort swelling of positronium confined in a small cavity.
publisher Public Library of Science (PLoS)
series PLoS ONE
issn 1932-6203
publishDate 2014-01-01
description The electron density at the positron (contact density) in the ground state positronium (Ps) formed in condensed matter is generally found to be lower than in vacuum. This is usually attributed to microscopic electric fields which polarize Ps, by acting on the two particles of the atom. In this paper we quantitatively investigate an opposite effect. It is due to the confinement of Ps in small cavities existing in the host solid (e.g. free volume in polymers), which increases the contact density. Although this phenomenon is greater, the smaller is the size of the cavity, Ps polarization seems to play anyway a predominant role.
url http://europepmc.org/articles/PMC4196961?pdf=render
work_keys_str_mv AT giovanniconsolati swellingofpositroniumconfinedinasmallcavity
AT fiorenzaquasso swellingofpositroniumconfinedinasmallcavity
AT davidetrezzi swellingofpositroniumconfinedinasmallcavity
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