Abstract
X-ray absorption measurements were made for Na K-edge on K 1−xNa xCl solid solutions at room and at low temperatures using synchrotron radiation. The prominent peak can be assigned as the exciton associated with intra-ionic transition of Na + ion. The small structure appearing in the edge is assigned as the exciton associated with the dipole-forbidden s-s transition. From the analysis of EXAFS spectra, it was concluded that the first shell distance around the sodium ion in the solid solution holds the value of the pure NaCl, and is insensitive to the concentration of NaCl in KCl.
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