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The effect of substrate work function on work function reduction of Re/W alloy-coated impregnated cathodes

  • Surfaces And Multilayers
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Abstract

The work function reduction at a metal surface caused by adsorbed barium and oxygen is already known with the resulting expression for the overall work function being ϕ=ϕS−δϕR. Results from the Re/W alloy-coated cathodes exhibit that δϕR increases with substrate work function with a slope of 1.09 by linear regression. A qualitative explanation of the above results comes from considering the arrangement of barium and oxygen on the surfaces. A charge transfer model is proposed for two-dimensional barium and oxygen lying on a flat non-interacting substrate. Calculation shows that the dipole strength increases with the charge transfer below the intermediate states.

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Authors and Affiliations

  1. Institute of Physics, Academia Sincia, 11529, Taipei, Taiwan, ROC

    C. S. Ares Fang

  2. Engineering Department, Cambridge University, Trumpington Street, Cambridge, UK

    C. E. Maloney

Authors
  1. C. S. Ares Fang
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  2. C. E. Maloney
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Ares Fang, C.S., Maloney, C.E. The effect of substrate work function on work function reduction of Re/W alloy-coated impregnated cathodes. Appl. Phys. A 50, 603–607 (1990). https://doi.org/10.1007/BF00323454

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  • DOI: https://doi.org/10.1007/BF00323454

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