High resolution electron energy loss study of AlxGa1−xAs mixed crystals

Abstract
The surface optical phonon spectra of AlxGa1−xAs mixed crystals have been measured by high resolution electron energy loss spectroscopy (HREELS). Two modes (Al–As and Ga–As types, respectively) were observed whose frequencies shifted almost linearly with aluminum concentration. The relative intensities of these modes are analyzed. Comparison is made with Raman scattering measurements and theoretical calculations.

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