材料期刊网

We have studied the effects of gamma-ray irradiation on the Fourier transform infrared grazing incidence reflection-absorption spectra of GaN films grown on alpha -Al2O3 (0001) substrates using metal-organic chemical vapour deposition at atmospheric pressure. After irradiation, the spectral intensity increased markedly and a series of new absorption features appeared, among which those at 3440, 3355, 3174, 3088, 2819, 2712, 2100, 1426 and 894 cm(-1) are discussed and identified. The reason why gamma-ray irradiation can enhance the intensity and give rise to these new features is also discussed.