Physisorption of positronium on quartz surfaces

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dc.creatorSaniz, R.
dc.creatorBarbiellini, B.
dc.creatorPlatzman, P. M.
dc.creatorFreeman, A. J.
dc.date2007-04-30
dc.date.accessioned2026-07-07T08:35:15Z
dc.date.available2026-07-07T08:35:15Z
dc.descriptionThe possibility of having positronium (Ps) physisorbed at a material surface is of great fundamental interest, since it can lead to new insight regarding quantum sticking and is a necessary first step to try to obtain a Ps$_2$ molecule on a material host. Some experiments in the past have produced evidence for physisorbed Ps on a quartz surface, but firm theoretical support for such a conclusion was lacking. We present a first-principles density-functional calculation of the key parameters determining the interaction potential between Ps and an $α$-quartz surface. We show that there is indeed a bound state with an energy of 0.14 eV, a value which agrees very well with the experimental estimate of $\sim0.15$ eV. Further, a brief energy analysis invoking the Langmuir-Hinshelwood mechanism for the reaction of physisorbed atoms shows that the formation and desorption of a Ps$_2$ molecule in that picture is consistent with the above results.
dc.description5 pages, 3 figures, submitted
dc.identifierhttps://arxiv.org/abs/0705.0037
dc.identifierhttp://arxiv.org/abs/0705.0037
dc.identifierPhys. Rev. Lett. 99, 096101 (2007)
dc.identifierdoi:10.1103/PhysRevLett.99.096101
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139688
dc.subjectMaterials Science
dc.subjectOther Condensed Matter
dc.titlePhysisorption of positronium on quartz surfaces
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