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- W2753242589 abstract "Modeling photoemission using the Moments Approach (akin to Spicer’s “Three Step Model”) is often presumed to follow simple models for the prediction of two critical properties of photocathodes: the yield or “Quantum Efficiency” (<i>QE</i>), and the intrinsic spreading of the beam or “emittance” ε<sub>n;rms</sub>. The simple models, however, tend to obscure properties of electrons in materials, the understanding of which is necessary for a proper prediction of a semiconductor or metal’s <i>QE</i> and ε<sub>n;rms</sub>. This structure is characterized by localized resonance features as well as a universal trend at high energy. Presented in this study is a prototype analysis concerning the density of states (DOS) factor <i>D</i>(<i>E</i>) for Copper in bulk to replace the simple three-dimensional form of <i>D</i>(<i>E</i>) = (<i>m</i>/π<sup>2</sup> <i>h</i><sup>3</sup>)p2mE currently used in the Moments approach. This analysis demonstrates that excited state spectra of atoms, molecules and solids based on density-functional theory can be adapted as useful information for practical applications, as well as providing theoretical interpretation of density-of-states structure, e.g., qualitatively good descriptions of optical transitions in matter, in addition to DFT’s utility in providing the optical constants and material parameters also required in the Moments Approach." @default.
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- W2753242589 date "2017-09-06" @default.
- W2753242589 modified "2023-09-27" @default.
- W2753242589 title "Calculation of density of states for modeling photoemission using method of moments" @default.
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- W2753242589 doi "https://doi.org/10.1117/12.2272749" @default.
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