Field emission from tungsten covered with germanium layers of atomic thickness

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Abstract
A numerical study of field emission from tungsten covered with germanium layers of atomic thickness is given, based on a one dimensional pseudopotential model for the adsorbed atoms. As a result a theory is proposed which explains at a semiquantitative level both the reduction in the total current, and the appearance of a second peak in the total energy distribution of the field emitted electrons. The observed variation of the field emission characteristics with the thickness of the adsorbed germanium is also explained.

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