Evidence of Positronium Bloch States in Porous Crystals of Zn4O-Coordination Polymers

被引：24

作者：

Dutta, Dhanadeep ^{[1
]}

Feldblyum, Jeremy I. ^{[2
,3
]}

Gidley, David W. ^{[1
]}

Imirzian, James ^{[1
]}

Liu, Ming ^{[4
,5
]}

Matzger, Adam J. ^{[2
,3
]}

Vallery, Richard S. ^{[6
]}

Wong-Foy, Antek G. ^{[2
]}

机构：

[1] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Ann Arbor, MI 48109 USA

[4] NIST Polymers Div, Gaithersburg, MD 20899 USA

[5] N Carolina State Univ, Dept Nucl Engn, Nucl Reactor Program, Raleigh, NC 27695 USA

[6] Grand Valley State Univ, Dept Phys, Allendale, MI 49401 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 19期

基金：

美国国家科学基金会;

关键词：

METAL-ORGANIC FRAMEWORKS; PORE-SIZE; TEMPERATURE-DEPENDENCE; ANNIHILATION LIFETIME; THIN-FILMS; DIFFUSION; POROSITY;

D O I：

10.1103/PhysRevLett.110.197403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Positronium (Ps) is shown to exist in a delocalized state in self-assembled metalorganic crystals that have large 1.3-1.5 nm cell sizes. Belonging to a class of materials with record high accessible specific surface areas, these highly porous crystals are the first to allow direct probing with simple annihilation lifetime techniques of the transport properties of long-lived triplet Ps in what is hypothesized to be a Bloch state. Delocalized Ps has unprecedented (high) Ps mobility driven primarily by weak phonon scattering with unusual and profound consequences on how Ps probes the lattice.

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页数：5

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