Enhanced thermionic currents by non equilibrium electron population of metals

Domenech-Garret, J.L and Tierno Gomez, Sandra Pilar and Conde López, Luis (2013). Enhanced thermionic currents by non equilibrium electron population of metals. "European Physical Journal B", v. 86:382 ; pp. 1-4. ISSN 1434-6028. https://doi.org/10.1140/epjb/e2013-40646-5.

Description

Title: Enhanced thermionic currents by non equilibrium electron population of metals
Author/s:
  • Domenech-Garret, J.L
  • Tierno Gomez, Sandra Pilar
  • Conde López, Luis
Item Type: Article
Título de Revista/Publicación: European Physical Journal B
Date: September 2013
ISSN: 1434-6028
Volume: 86:382
Subjects:
Faculty: E.U.I.T. Aeronáutica (UPM)
Department: Física y Química Aplicada a la Técnica Aeronáutica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

An analytical expression is derived for the electron thermionic current from heated metals by using a non equilibrium, modified Kappa energy distribution for electrons. This isotropic distribution characterizes the long high energy tails in the electron energy spectrum for low values of the index ? and also accounts for the Fermi energy for the metal electrons. The limit for large ? recovers the classical equilibrium Fermi-Dirac distribution. The predicted electron thermionic current for low ? increases between four and five orders of magnitude with respect to the predictions of the equilibrium Richardson-Dushmann current. The observed departures from this classical expression, also recovered for large ?, would correspond to moderate values of this index. The strong increments predicted by the thermionic emission currents suggest that, under appropriate conditions, materials with non equilibrium electron populations would become more efficient electron emitters at low temperatures.

More information

Item ID: 26433
DC Identifier: http://oa.upm.es/26433/
OAI Identifier: oai:oa.upm.es:26433
DOI: 10.1140/epjb/e2013-40646-5
Deposited by: Memoria Investigacion
Deposited on: 23 Oct 2014 14:43
Last Modified: 23 Oct 2014 14:43
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