Observation of Surface Layering in a Nonmetallic Liquid
نویسندگان
چکیده
منابع مشابه
Observation of surface layering in a nonmetallic liquid.
Oscillatory density profiles (layers) have previously been observed at the free surfaces of liquid metals but not in other isotropic liquids. We have used x-ray reflectivity to study a molecular liquid, tetrakis(2-ethylhexoxy)silane. When cooled to T/Tc approximately 0.25 (well above the freezing point for this liquid), density oscillations appear at the surface. Lateral order within the layers...
متن کاملX-ray reflectivity measurements of surface layering in liquid mercury.
The surface normal structure of the mercury liquid-vapor interface has been investigated by measuring the x-ray reflectivity out to a momentum transfer of qz 2.5 Å . The results provide direct experimental proof of surface layering in liquid metals. The layer spacing is given by the atomic dimensions of the Hg atoms. The minimum layer width agrees well with the predictions of capillary wave t...
متن کاملCapillary-wave roughening of surface-induced layering in liquid gallium.
The temperature dependence of surface-induced atomic layering in liquid gallium has been investigated with x-ray reflectivity. The prominent layering peak at qz52.4 Å 21 decreases dramatically upon heating from 22 to 170 °C, but its width stays, unexpectedly, unchanged. The decrease is traced to the temperature dependence of capillary-wave induced surface roughness. The constant width indicates...
متن کاملSurface layering in liquid gallium: An X-ray reflectivity study.
Surface-induced atomic layering in liquid gallium has been observed using x-ray reflectivity, ultrahigh vacuum conditions, and sputtered clean surfaces. Reflectivity data, collected on a supercooled liquid sample to momentum transfers as large as qz 3.0 Å21, exhibit a strong maximum near 2.4 Å21 indicating a layer spacing that is comparable to its atomic dimensions. The amplitude of the elect...
متن کاملCompetition between Surface Layering and Surface Phase Formation in Dilute Liquid HgAu Alloys
We present temperature-dependent X-ray reflectivity measurements of liquid Hg alloyed with 0.06-0.20 atom % Au. At low Au concentrations, we find temperature-dependent surface-induced layering similar to that observed in pure Hg, except that the presence of Au reduces the layering amplitude. Upon approaching the solubility limit of Au in Hg, a new surface phase forms which is 1-2 atomic diamete...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2006
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.96.096107