Vibrational spectroscopy of hydrogenated GaAs_(1-y)N_y: A structure-sensitive test of an H_2^*(N) model.

The N- and H-vibrational modes in hydrogenated GaAs1-yNy alloys have been studied by infrared absorption spectroscopy. Data for samples containing both H and D show that the dominant defect complex seen in the infrared spectrum of hydrogenated GaAs1-yNy contains two weakly coupled N-H stretching modes. This conclusion is inconsistent with the predictions of theory for an H-2(*)(N) defect that has been proposed recently to explain the properties of H in GaAs1-yNy and InxGa1-xAs1-yNy alloys.