Chemical reactions with accelerated ions. Chemical effects of 32P+-ions implanted in NaCl single crystals

Abstract

An electromagnetic isotope separator has been used for implantation of 40 keV ³²P⁺ ions in single crystals of sodium chloride. The penetration of the implanted ions and their diffusion during storage at various temperatures have been measured by a new chemical sectioning technique. The chemical distribution of the ³²P-ions has been determined after dissolution of the crystals. It reflects the variation in range distribution observed by varying the angle between the incident beam and the (100) plane. Deeply penetrating tails have a high content of the ³²P(V)-precursor. A close correlation is established between the ³²P(V)-precursor and changes in the range distribution due to diffusion. The chemical distribution depends to some extent on reactions occurring during dissolution. Thermal- and photo-annealing show the existence of two ³²P(I)-precursors.