Anomalous Layering at the Liquid Sn Surface

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Anomalous Layering at the Liquid Sn Surface

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Title: Anomalous Layering at the Liquid Sn Surface
Author: Shpyrko, Oleg G.; Grigoriev, Alexei Yu.; Steimer, Christoph; Pershan, Peter S.; Lin, Binhua; Meron, Mati; Graber, Tim; Gerbhardt, Jeff; Ocko, Ben; Deutsch, Moshe

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Citation: Shpyrko, Oleg G., Alexei Yu Grigoriev, Christoph Steimer, Peter S. Pershan, Binhua Lin, Mati Meron, Tim Graber, Jeff Gerbhardt, Ben Ocko, and Moshe Deutsch. 2004. Anomalous layering at the liquid Sn surface. Physical Review B 70:224206.
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Abstract: X-ray reflectivity measurements on the free surface of liquid Sn are presented. They exhibit the high-angle peak, indicative of surface-induced layering, also found for other pure liquid metals (Hg, Ga, and In). However, a low-angle shoulder, not hitherto observed for any pure liquid metal, is also found, indicating the presence of a high-density surface layer. Fluorescence and resonant reflectivity measurements rule out the assignment of this layer to surface segregation of impurities. The reflectivity is modeled well by a 10% contraction of the spacing between the first and second atomic surface layers, relative to that of subsequent layers. Possible reasons for this are discussed.
Published Version: doi:10.1103/PhysRevB.70.224206
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