Thumbnail
Access Restriction
Open

Author Rasor, Ned S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ANIONS ♦ CESIUM ♦ DIAGRAMS ♦ ELECTRIC CONDUCTIVITY ♦ ELECTRON EMISSION ♦ ELECTRONS ♦ ION EMISSION ♦ LANGMUIR PROBE ♦ THERMIONIC CONVERTERS ♦ THERMIONIC DIODES ♦ THERMIONIC EMISSION ♦ VAPORS ♦ WORK FUNCTIONS
Abstract Compelling experimental evidence is given that a longstanding limit encountered on cesium vapor thermionic energy converter performance improvement and other anomalies arise from thermionic emission of cesium negative ions. It is shown that the energy that characterizes thermionic emission of cesium negative ions is 1.38 eV and, understandably, is not the electron affinity 0.47 eV determined for the photodetachment threshold of the cesium negative ion. The experimental evidence includes measurements of collector work functions and volt-ampere characteristics in quasi-vacuum cesium vapor thermionic diodes, along with reinterpretation of the classic Taylor-Langmuir S-curve data on electron emission in cesium vapor. The quantitative effects of negative ion emission on performance in the ignited, unignited, and quasi-vacuum modes of cesium vapor thermionic converter operation are estimated.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-14
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 120
Issue Number 6


Open content in new tab

   Open content in new tab