ATOMIC DISPLACEMENT BY X-RAY-EXCITATION IN NACL CRYSTAL CONTAINING CU+ IONS

The x-ray excitation spectra around Cu K-edge in sodium chloride cryst als containing a small amount of Cu+ ions are measured at 11K to 200K. We found Cu+ ion displacements and growths to micro-clusters (micro-c rystals) of CuCl2 in sodium chloride crystal by x-ray irradiation. The trace of the formation is presented by observing the XAFS spectra and XEOL (X-ray Excitation Optical Luminescence) intensities at various t emperatures. Ar low temperature below about 50 K, the micro-clusters o r the micro-crystals of CuCl2 hardly create. The higher temperature mo ves the ions faster and further, and makes more active to form the CuC l2 micro-crystals in bulk. The process of moving of the Cu+ ion is dis cussed.