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- W1993228911 abstract "The Al ${mathit{L}}_{2,3}$ soft-x-ray reflection and emission spectra of ${mathrm{Al}}_{mathit{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$As have been measured for x between 0.17 and 1.0. The valence-band maximum was monitored via the emission spectra using a fit based on band-structure parameters. The dominant features in the reflection spectra are produced by the ${mathit{L}}_{2,3}$ core excitons. Since both the reflection spectra and emission spectra were obtained using the same soft-x-ray spectrometer, the energies of the excitons above the valence-band maximum are accurately obtained. The known values of the optical band gap, as a function of x, are then used to determine the core exciton binding energy. The core excitons are found to follow and lie above the conduction-band minimum by 0.3 eV as the Al composition changes. Our results are compared to various core exciton theories and to previous experiments." @default.
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- W1993228911 date "1992-12-15" @default.
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- W1993228911 title "AlL2,3core excitons inAlxGa1−xAs studied by soft-x-ray reflection and emission" @default.
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- W1993228911 doi "https://doi.org/10.1103/physrevb.46.15116" @default.
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