Abstract
Sharp-line emission near the absorption edge due to recombination of electrons and holes in recently available high-purity GaAs has been observed. At 4.2\ifmmode^\circ\else\textdegree\fi{}K exciton emission is observed at 1.5143\ifmmode\pm\else\textpm\fi{}0.0005 eV. The temperature dependence of this line is followed to 200\ifmmode^\circ\else\textdegree\fi{}K and discussed. Below the energy gap a set of three lines is observed separated from each other by a longitudinal optical mode phonon energy (0.0364\ifmmode\pm\else\textpm\fi{}0.0005 eV). In crystals grown in an ${\mathrm{O}}_{2}$ atmosphere an emission is observed apparently due to recombination of a bound exciton. The intensity of this line relative to the exciton line increases with ${\mathrm{O}}_{2}$ pressure and occurs 0.0015 eV below the exciton line.
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