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- W3100333566 abstract "The energies, widths, and shapes of features observed in the total energy distributions in field emission from W(100) and W(111) are compared with the results of a full-potential LAPW calculation of the surface density of states based on a supercell model of the crystal structure at the metal-vacuum interface. The Swanson hump on W(100) is attributed to two bands of surface states and surface resonances of dz^2 symmetry that are highly localised at the center of the surface Brillouin zone (Gamma_bar), and a second peak observed at lower energy is attributed to a band of surface resonances, also of dz^2 symmetry, centred at 0.11 A^(-1) along Gamma_bar to X_bar. The energy scale of the calculated total energy distribution is compressed by about 20% relative to the experimental data. The present calculation yields strong evidence that the broad asymmetric peak observed on W(111) is due to emission from a band of surface resonances. Further calculations for W(111) are proposed both to test the accuracy of the band model and to take into account the velocity factor that enters in a calculation of the emission current." @default.
- W3100333566 created "2020-11-23" @default.
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- W3100333566 date "2001-08-01" @default.
- W3100333566 modified "2023-09-25" @default.
- W3100333566 title "Surface states and resonances in field emission from low-index facets of clean tungsten" @default.
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- W3100333566 doi "https://doi.org/10.1016/s0079-6816(01)00032-6" @default.
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