- Autor(in)
- Sponsor(in)
- Referenz
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10 B. Bayat, H.-W. Wassmuth, Surf. Sci. 133 (1983) 1
11 J. Crank, The Mathematics of Diffusion, Oxford University Press 1975
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- Seitenbereich
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0315 - 0320
- Schlagwort(e)
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<KWD>Surface diffusion
Alkalis
Desorption
- Zusammenfsg.
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From the temperature dependence of these quantities the parameters of desorption (<I>E</I><sub>des</sub>,<sup><I>i</I></sup> τ<sub>0</sub>) and surface diffusion (<I>E</I><sub>diff</sub>, <I>D</I><sub>0</sub>) for K, Rb and Cs on Si(111) were obtained. The values of <I>E</I><sub>diff</sub> and <I>D</I><sub>0</sub> are comparably high and may be interpreted by non-localized diffusion according to a model proposed by Bonzel (Surf. Sci. <B>21</B> (1970) 45).
In the temperature range 1120 … 800 K, the mean adsorption lifetime τ(<I>T</I>) = τ<sub>0</sub> · exp(<I>E</I><sub>des</sub><sup><I>i</I></sup>/<I>kT</I>) and the mean diffusion length <I>x</I>(<I>T</I>) - defined in the equilibrium between adsorption, diffusion and desorption - were measured. From these data the diffusion constant <I>D</I>(<I>T</I>) = <I>D</I><sub>0</sub> · exp(-<I>E</I><sub>diff</sub>/<I>kT</I>) was obtained as <I>D</I> = <I>x</I><sup>-2</sup>/τ. For temperatures <I>T</I> 750 K, the diffusion constant was calculated from nonstationary alkali concentration profiles using the Boltzmann-Matano method.
Using pulsed atomic beam technique and a surface ionization ion microscope, the desorption kinetics and the surface diffusion of the alkalis potassium, rubidium and cesium were investigated on a Si(111)7 × 7-surface at extremely low alkali coverages.
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