Abstract
The mass spectra of ion beams extracted from the impregnated-electrode type liquid gold-antimony ion sources have been investigated. Either eutectic alloy Au66Sb34 or intermetallic compound AuSb2 was used as the source material. The mass spectra were studied as a function of source current or as a function of source temperature, to investigate the behavior of Sb atoms. Analysis of liquid flow and evaporation within the ion source demonstrated that the alloy composition at the ionization point was determined by selective evaporation of Sb atoms, especially for the AuSb2 ion source. Relative intensities of multiply charged monomer ions strongly depended on the estimated concentration of Sb at the ionization point, which determined the evaporation field strength. Also, relative intensities of molecular ions were almost proportional to the estimated concentration of Sb. The present results indicated that ion formation in the liquid gold-antimony ion sources was dominated by the alloy composition at the ionization point. As a result, Au66Sb34 was found to be the preferred material.
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