Measurements of time and temperature-dependent photoconductivity with synchrotron excitation could be useful for studying the nature of intrinsic and extrinsic electronic states in the bulk of semiconductors if defect states could be site- and symmetry- selectively excited from core levels. From two trap states in CuAlO2 one could be selectively excited from Cu2p core level, while the other was coupled to O1s ones. The observed Fe2s modulated photoconductivity spectrum of iron in Si suggested the possibility of site-selective excitation. For the first time, successful thermally stimulated conductivity measurements with synchrotron excitation were performed on Si:(B,Cr).

Defect Spectroscopy with Local Excitation from Core Levels. I.Konovalov, L.Makhova, R.Mitdank: Physica B, 2007, 401-402, 654-7