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Erhöhung der Feldelektronen-Emission von Wolframspitzen durch Aufdampfen von Beryllium

Increase of the fieldemission of electrons from W-tips by evaporation of beryllium

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Zeitschrift für Physik A Hadrons and nuclei

Abstract

The mean work function of tungsten determined from Fowler-Nordheim plots can be reduced from 4.5 to 2.5 eV by depositing a thin layer of evaporated beryllium and subsequent thermal treatment at 800 °C in a vacuum of 10−7 to 10−10 Torr. Electron and ion field emission patterns of tungsten tips with and without beryllium demonstrate the effect of the beryllium deposit. For an application of the tungsten tips with beryllium, the excellent stability and the high emissivity at low voltages are of interest.

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Authors and Affiliations

  1. Institut für Angewandte Physik der Universität Tübingen, Deutschland

    U. Decker,  G. Möllenstedt & E. Wurster

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  1. U. Decker
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  2. G. Möllenstedt
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  3. E. Wurster
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Additional information

Herrn Prof. Dr. F. Bopp zum 60. Geburtstag gewidmet.

Fa. Osram, Entwicklung-Herbrechtingen.

Der Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. sind wir für personelle Hilfe dankbar. Der Firma Osram, Entwicklung-Herbrechtingen, insbesondere Herrn Direktor Dr. W. Schilling sind wir für die freundliche und großzügige Hilfe bei der Durchführung der Arbeit zu besonderem Dank verpflichtet.

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Decker, U., Möllenstedt, G. & Wurster, E. Erhöhung der Feldelektronen-Emission von Wolframspitzen durch Aufdampfen von Beryllium. Z. Physik 229, 316–320 (1969). https://doi.org/10.1007/BF01396256

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  • DOI: https://doi.org/10.1007/BF01396256

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