Dynamics of the H-CAs complex in GaAs determined from Raman measurements

The frequencies of the localized vibrational modes of H-C subAs pairs in GaAs epitaxial layers have been measured using Raman spectroscopy for all four isotopic combinations involving high12 C, high13 C, H, and D. Good agreement has been obtained with earlier infrared-absorption measurements, but, in addition, the symmetry of the two A1 modes and two E modes of each isotopic combination has been determined directly from the relative intensities of the scattering for different polarizations of the incident and scattered light. The hydrogenlike wag mode of H-C sub As has been found and its frequency of 738.6 cm high-1 is in close agreement with the predictions of modeling.