Emission of low-energy positronium from alkali-metal coated single-crystal tungsten surfaces

被引：3

作者：

Iida, S. ^{[1
]}

Wada, K. ^{[2
,4
]}

Mochizuki, I. ^{[2
]}

Tachibana, T. ^{[3
]}

Yamashita, T. ^{[1
]}

Hyodo, T. ^{[2
]}

Nagashima, Y. ^{[1
]}

机构：

[1] Tokyo Univ Sci, Dept Phys, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan

[2] High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan

[3] Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan

[4] Natl Inst Quantum & Radiol Sci & Technol, Quantum Beam Sci Res Directorate, Watanuki 1233, Takasaki, Gunma 3701292, Japan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2016年 / 28卷 / 47期

关键词：

positron; positronium; inter-band transition; surface plasmon excitation; alkali-metal; ADSORPTION; INCREASE; STATES; FILMS;

D O I：

10.1088/0953-8984/28/47/475002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have measured the time-of-flight of ortho-positronium emitted from Cs-, Na- and Li-coated single-crystal tungsten surfaces. The data obtained after the coating show a new positronium energy component with a specific energy loss in addition to the component whose emission energy is simply determined by the positron and the electron work functions. We suggest that this new component is attributed to the formation of positronium accompanied by inter-band transition and/or surface plasmon excitation at the surfaces.

引用

页数：4

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