SURFACE DIFFUSION INVESTIGATED BY ION CURRENT NOISE METHOD*)


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Abstract

The surface diffusion for two magnesium isotopes on polycrystalline tungsten and ionic thermal desorption are studied by a method based on the ion current noise arising from the fluctuation of the work function as a result of random fluctuations of the magnesium adsorbate density. The activation energy for surface diffusion for magnesium isotopes have been determined by measuring the spectral density functions and their parameters.

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