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- W2085186329 abstract "Measurements are reported for ${ensuremath{epsilon}}_{1}$ and ${ensuremath{epsilon}}_{2}$, the real and imaginary parts of the dielectric constant, of Rb and Cs at room temperature in the frequency range 0.5-4.0 eV. The experiments were performed by multiple reflection at metal-silica interfaces employing the technique used earlier on Na and K. The optical absorption of Rb shows structure which can be attributed to conventional interband transitions within the nearly free-electron model. The optical absorption of Cs also shows structure, but the threshold occurs at a lower frequency than that predicted by the nearly free-electron model. Both metals show a leveling off and a perceptible rise in the absorption at the high-frequency end of the range. The possibility of absorption due to many-body effects or transitions to $d$ bands above the Fermi level is discussed. The results for ${ensuremath{epsilon}}_{1}$ are used to deduce values for the infrared optical masses which are found to be 1.16 m for Rb and 1.19 m for Cs." @default.
- W2085186329 created "2016-06-24" @default.
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- W2085186329 date "1970-10-15" @default.
- W2085186329 modified "2023-09-25" @default.
- W2085186329 title "Optical Constants of Rubidium and Cesium from 0.5 to 4.0 eV" @default.
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- W2085186329 doi "https://doi.org/10.1103/physrevb.2.2840" @default.
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