ANOMALOUS ELECTRON-EMISSION SPECTRA AND POLARIZATION PHENOMENA IN A LEAD MAGNESIUM NIOBATE SINGLE-CRYSTAL

The time dependences of the intensity and the energy positions of fine -structure of the spectra of anomalous electron emission from a polari zed lead magnesium niobate (PMN) single crystal irradiated with soft x -rays are investigated experimentally. It is shown that the relaxation time of the electret charge can be determined from the graphs of thes e dependences, and the depth distribution of the potential in the surf ace layer of the sample can be determined from the profile of the anom alous electron emission spectrum. Estimates of the fields in the surfa ce layers of a polarized PMN single crystal, obtained from the charact eristics of the anomalous electron emission spectra, agree with data o btained by electrophysical research techniques. (C) 1997 American Inst itute of Physics.