Emission of low-energy positronium from alkali-metal coated single-crystal tungsten surfaces. (23rd September 2016)

• Record Type: Journal Article
• Authors: Iida, S; Wada, K; Mochizuki, I; Tachibana, T; Yamashita, T; Hyodo, T; Nagashima, Y
• Is Part Of: Journal of physics. Volume 28:Number 47(2016)
• Publication Date: 2016-09-23
• Subjects: positron -- positronium -- inter-band transition -- surface plasmon excitation -- alkali-metal; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/47/475002
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: 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.