The localized vibrations of charged and uncharged impurities in GaAs and GaP

Abstract
Beryllium-doped GaAs grown by the liquid phase epitaxial technique shows an infrared absorption line due to the localized vibrations of 9BeGa at 482 cm-1. This is discussed in relation to vibrations of 9BeGa in GaP and boron in GaAs and GaP.