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.
| Original language | English |
|---|---|
| Article number | 224206 |
| Pages (from-to) | 224206-1-224206-7 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 70 |
| Issue number | 22 |
| DOIs | |
| State | Published - Dec 2004 |
Bibliographical note
Funding Information:We thank Matt Newville, Larry Sorensen, and John Rehr for helpful discussions on IFEFFIT use. This work has been supported by U.S. Department of Energy Grant No. DE-FG02-88-ER45379, National Science Foundation Grant No. DMR-01-12494, and the U.S.-Israel Binational Science Foundation, Jerusalem. ChemMatCARS Sector 15 is principally supported by the National Science Foundation/Department of Energy under Grant No. CHE0087817. The Advanced Photon Source is supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under Contract No. W-31-109-Eng-38.
Funding
We thank Matt Newville, Larry Sorensen, and John Rehr for helpful discussions on IFEFFIT use. This work has been supported by U.S. Department of Energy Grant No. DE-FG02-88-ER45379, National Science Foundation Grant No. DMR-01-12494, and the U.S.-Israel Binational Science Foundation, Jerusalem. ChemMatCARS Sector 15 is principally supported by the National Science Foundation/Department of Energy under Grant No. CHE0087817. The Advanced Photon Source is supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under Contract No. W-31-109-Eng-38.
| Funders | Funder number |
|---|---|
| National Science Foundation | DMR-01-12494 |
| U.S. Department of Energy | CHE0087817, DE-FG02-88-ER45379 |
| Directorate for Mathematical and Physical Sciences | 0087817 |
| Office of Science | W-31-109-Eng-38 |
| Basic Energy Sciences | |
| United States-Israel Binational Science Foundation |