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Abstract
Two previously unreported shallow acceptor levels with ionization energies of 25.2 and 43.2 meV, respectively, have been observed in a number of vapor phase epitaxial and metalorganic chemical vapor deposited GaAs samples grown in several different laboratories. The corresponding donor-to-acceptor and conduction band-to-acceptor transitions are identified in low temperature photoluminescence spectra by means of their temperature and excitation intensity-dependence. These levels are present as residual acceptors in high purity material, but their chemical and/or metallurgical nature has not yet been determined.
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