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Ion desorption from cesium chloride and cesium-adsorbed soil by surface ionization

Baba, Yuji ; Shimoyama, Iwao  

When a solid is heated in vacuum, a part of the surface layer desorbs as ions, which is known as "surface ionization". In this report, we present the results for surface ionization of bulk cesium chloride (CsCl). When the positive potential was applied to the sample, we found that the Cs$$^{+}$$ ions were desorbed at around 410 $$^{circ}$$C, which is lower than the melting point of CsCl (645 $$^{circ}$$C). The low desorption temperature was explained by the changes in the work function of the CsCl surface. As an application, we also investigated the desorption of Cs$$^{+}$$ ions from Cs-adsorbed soil. When Cs-adsorbed soil was heated at 460 $$^{circ}$$C for 2 hours, about 13% of Cs was desorbed as Cs$$^{+}$$ ions. The results suggest that the surface ionization would possibly be applied to the desorption of Cs from contaminated soil.

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