Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 8: Postersitzung I: Supraleitung
TT 8.52: Poster
Montag, 8. März 2004, 14:30–19:00, Poster A
The effect of noble-gas preplating on quench-condensed hydrogen films — •Stefan Tibus, Jürgen Klier, and Paul Leiderer — Universität Konstanz, Universitätsstraße 10, 78464 Konstanz
Triple-point dewetting of H2 on e.g. Au is a well-known phenomenon and prevents the forming of a thick (i.e. more than a few monolayers) solid equilibrium film on such surfaces. It was theoretically shown that a modification of the substrate-adsorbate interaction by means of preplating should lead to complete wetting and thus to a thick solid film at saturated vapor pressure (provided that the substrate surface is ideally smooth). Ne and Ar were found to be appropriate candidates as intermediate layers, but investigations found no significant change in the film thickness upon preplating, which was attributed to the roughness of the substrate.
However, preliminary experiments with quench-condensed hydrogen showed an effect of the preplating on the film’s structure. This is to be investigated in more detail by means of a new experimental setup allowing for both surface-plasmon microscopy (at a higher resolution than before) as well as surface-plasmon spectroscopy.