Abstract
The initial stages of growth of Fe on a well-defined single crystal Ag(100) surface have been investigated by means of thermal energy helium diffraction. We report on specular beam spot profiles obtained at 0.5 monolayer for several temperatures of deposition in the range of 135–300 K. Typical sidebands ("satellites") in diffraction patterns allow one to estimate the mean separation <L> between islands. Experimental data in the range of 135–228 K show a linear dependence of ln < L> as a function of the inverse of the temperature of deposition, while at higher temperatures a clear deviation from this law is found, indicating a change in the regime of growth. The nucleation of small islands turns out to be the factor which favors two-dimensional growth at low temperature.
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