Abstract
The localized vibrational mode of carbon substituted at arsenic sites in gallium arsenide (GaAs) was measured with infrared absorption spectroscopy at 0.005 cm−1 resolution. Well-resolved fine structures were observed, yielding quantitative information on the line half widths and intensities. The relative intensities of the isotope lines are well fitted to a probability factor calculation using a natural abundance of 55.3% Ga69. One explanation considered is that the dipole moment due to the relative displacement of carbon with respect to the gallium atoms has a tendency to be larger when the neighboring gallium atoms are heavier (71Ga).
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