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- W2040435127 abstract "A previous calculation of the total energy distribution of field-emitted electrons in the presence of chemisorbed atoms by Penn, Gomer, and Cohen (PGC) is reexamined with respect to the following point. PGC assumed that the metal-adsorbate system could be represented by the Anderson model; however, the Anderson model is phenomenological. Anderson and McMillan have shown how the model can be reformulated in a way which makes it more quantitative. Use of the reformulated model leads to a significant change in the PGC result for the field-emission current. We find $frac{ensuremath{Delta}j(ensuremath{omega})}{{j}_{0}(ensuremath{omega})}={R}^{ensuremath{-}1}{u}^{ensuremath{'}2}{ensuremath{rho}}_{a}$, where $ensuremath{Delta}j(ensuremath{omega})$ is the change in the current at energy $ensuremath{omega}$ due to the presence of the adsorbate and ${j}_{0}(ensuremath{omega})$ is the current in the absence of the adsorbate. ${ensuremath{rho}}_{a}$ is the density of states at the absorbate and ${u}^{ensuremath{'}2}$ and ${R}^{ensuremath{-}1}$ are given in the text. This result differs from that of PGC by the factor $R={[1+{ensuremath{xi}}^{frac{3}{2}}{(ensuremath{pi}ensuremath{alpha})}^{ensuremath{-}frac{1}{2}}]}^{2}$, where $ensuremath{xi}={(ensuremath{-}frac{2m{E}_{F}}{{ensuremath{hbar}}^{2}})}^{frac{1}{2}}$ and $ensuremath{alpha}=frac{2meF}{{ensuremath{hbar}}^{2}}$. Energies are measured from the vacuum level, ${E}_{F}$ is the metal Fermi energy, and $F$ is the strength of the external electric field. For typical experimental conditions ${R}^{ensuremath{-}1}ensuremath{approx}frac{1}{16}$." @default.
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- W2040435127 date "1974-02-01" @default.
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- W2040435127 title "Field emission from adsorbate covered surfaces. II" @default.
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- W2040435127 doi "https://doi.org/10.1103/physrevb.9.844" @default.
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