Chemical shifts of ²³Na in NaCl crystal specimens implanted with xenon ions

Na clusters containing 10 to less than 1000 metal sodium atoms and blisters containing xenon inclusions were formed in NaCl crystal specimens prepared by xenon ion implantation to single crystal NaCl with fluences more than or equal to 2 × 10¹⁶/cm² at the energy of 36 keV. Experiments indicated that on the condition of xenon ion fluences more than or equal to 1 × 10¹⁷/cm² the xenon inside the inclusions formed in NaCl crystal specimens is in solid state and the solid state molecules NaXe are formed through the combination of Xe with Na in Na clusters. The chemical shift of ²³Na in solid state molecules NaXe relative to ²³Na in single crystal NaCl was measured and is equal to -17 ppm.