イオン減速法によるターゲットの作製

概要

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Studies of direct deposition of decelerated ions from an isotope separator on thin foils were reported. Fundamental behavior of decelerated ions was investigated by measurement of ion currents to various electrodes placed in the collector part. A magnetic field of 1000 gauss produced by a permanent maghet was set in the place of decelerating electric field, so that one can measure. the ion current without electron contamination and avoid accelerated electrons from bombardingthe target. The attachment efficiency was studied as a function of final energy of ions, backing materials and their thickness. From these studies, optimum working conditions for obtaining good deposition were obtained. The ion beam used in the present experiments was that of Mg24 and the backing materials were Au, Cu, Ni and Ta foils. As examples, Mg24 with a thickness of 500μg/cm2 was obtained on a Au foil of 5 μ thickness with a current density of 30 μA/cm2 and Mg24 with a thickness of 300 μg/cm2 was obtained on a Au foil of 0.5 μ thickness with a current density of 20 μA/cm2.
日本質量分析学会の論文