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Infrared absorption measurements have been carried out on a carbon–oxygen complex in gallium arsenide. The stretching mode at 2059.6 cm−1 has been investigated at low temperatures with polarized light under uniaxial stress in the 〈100〉, 〈111〉, and 〈110〉 crystallographic directions. The splitting behavior due to lifting of orientational degeneracy shows that the center has tetragonal symmetry. The...
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