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In the analysis of time-reversal and Mossbauer absorption experiments, it is important to consider atomic processes which interfere with the dllect nuclear transition. Interaction of the photon with the atomic electrons causes the radiation to acquire a phase shift,-specified by the interference parameter s(L1T). We present theoretical

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Changes in the surface of copper (I) oxide resulting from vacuum annealing and reoxidation after vacuum annealing have been investigated using positron annihilation induced Auger electron spectroscopy (PAES). The PAES measurement shows a large monotonic increase in the intensity of the annihilation induced Cu (M 2,3 VV) Auger peak as the sample is subjected to thermal anneal in the vacuum at 300 0 C temperature for 13 minutes. Exposure of the vacuum annealed surface to oxygen resulted in a large reduction of Cu (M 2,3 VV) intensity and an increase in the signal due to the KLL transition in O. These results provide a clear demonstration of the utility of PAES in the study of oxide surfaces.

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