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- W2025523154 abstract "The reflectance of evaporated Be layers has been measured after 3-min exposure to ambient pressures of ensuremath{le}3ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}7}$ Torr, for the wavelength range of 480-1200 AA{}, for a spread of angles between 20ifmmode^circelsetextdegreefi{} and 80ifmmode^circelsetextdegreefi{}. These values give $n$ and $k$ by calculation; also, from these ${ensuremath{epsilon}}_{1}$, ${ensuremath{epsilon}}_{2}$, $mathrm{Re}(frac{1}{ensuremath{epsilon}})$, and $mathrm{Im}(frac{1}{ensuremath{epsilon}})$. The last two functions show good agreement with an inverted Drude-Sellmeier resonance formula. The center frequency of the resonance falls at 18.4ifmmodepmelsetextpmfi{}0.1 eV, corresponding to the natural plasma-resonance frequency of a free-electron gas with 2.0 electrons per atom; this confirms a 1948 prediction by A. Bohr. The half-width of the resonance is measured as 4.7ifmmodepmelsetextpmfi{}0.1 eV; this value is also obtained, within ifmmodepmelsetextpmfi{}10%, from a sum-rule approximation, and is thought to represent an upper limit of the systematic error. This value corresponds to a decay time (for intensity) of the plasma oscillation of about 1.3ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}16}$ sec. An Argand-diagram display of the data is given, and the longitudinal Kramers-Kronig relationship is demonstrated." @default.
- W2025523154 created "2016-06-24" @default.
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- W2025523154 date "1968-08-15" @default.
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- W2025523154 title "Reflectance and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mi>ε</mml:mi></mml:mrow></mml:mfrac></mml:math>Resonance of Beryllium in the Far Ultraviolet" @default.
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- W2025523154 doi "https://doi.org/10.1103/physrev.172.670" @default.
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