Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
A self-consistent model of electron emission from metals
Ist Teil von
IEEE transactions on dielectrics and electrical insulation, 1999-08, Vol.6 (4), p.430-435
Ort / Verlag
IEEE
Erscheinungsjahr
1999
Quelle
IEL
Beschreibungen/Notizen
We present a model of electron emission from metals, which takes into account deviation of the electron distribution function from the Fermi equilibrium form inside the cathode under the emission effect. Using the Grad method electron distribution function, the emission boundary is expressed consecutively in terms of its hydrodynamic moments: temperature, average velocity, heat flux density. These hydrodynamic moments are caused by the emission itself and thus need a self-consistent determination. New easy-to-use equations for the emission current density, emission heat flux, and total energy distribution function of the emitted electrons are proposed. Consideration was made for a wide range of temperatures (/spl les/3500 K), field strengths (/spl les/1.5/spl times/10/sup 8/ V/cm) and work function (3.0 to 4.5 eV) of the emitter. A considerable deviation from the Fowler-Nordheim (FN) theory was found at high current density (>10/sup 9/ A/cm/sup 2/).