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The structure and vibrational modes of H-CAs pairs in passivated AlAs grown by chemical beam epitaxy

AlAs layers grown by chemical beam epitaxy (CBE) and doped with either 12C or 13C have been passivated with hydrogen or deuterium. Infrared absorption lines due to hydrogen stretch modes, symmetric A1, modes and 'carbon-like' E modes of H-CAs and D-CAs pairs have been assigned for both carbon isotopes. Comparisons have been made with previous measurements made on H-CAs centres in GaAs:C and with simple harmonic models, and the results are shown to be in agreement with ab initio local density functional calculations.