Field-Induced Desorption of Cesium from Rhenium |
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Authors: | Bernatskii D. P. Pavlov V. G. |
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Affiliation: | 1.Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia ; |
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Abstract: | Desorption of cesium atoms from a rhenium point emitter in an electric field has been studied by method of field-desorption microscopy (FDM). Dependence of the desorbing field on degree of emitter surface coverage with Cs atoms is established. The heat of Cs-atom adsorption, which is dependent on the surface concentration of adsorbate and work function of the surface, is estimated in the framework of the model of mirror-image forces for field-induced desorption. Saturation of the rhenium emitter with carbon leads to changes in the character of desorption and in the distribution of desorption zones on the emitter surface. |
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