Charles University in Prague, Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague 8, Czech Republic.
J Phys Condens Matter. 2012 Jan 11;24(1):015002. doi: 10.1088/0953-8984/24/1/015002. Epub 2011 Nov 18.
We have deposited two monolayers of Sn onto Rh(111) single crystal. After the deposition, no ordered structure was revealed by low energy electron diffraction (LEED). We oxidized the obtained system in a low-pressure oxygen atmosphere at 420 K. The oxidized sample was then gradually heated to study the thermal stability of the oxide layer. We characterized the system by synchrotron radiation stimulated photoelectron spectroscopy and LEED. Valence band and core level photoelectron spectra of rhodium, tin and oxygen were used to study the oxidation of the Sn-Rh(111) surface and its behaviour upon annealing. A low stoichiometric oxide of Sn was created on the surface. The oxidation process did not continue towards creation of SnO(2) with higher oxygen dose. The annealing at 970 K caused decomposition of the surface oxide of Sn and creation of an ordered (√3 × √3)R30° Sn-Rh(111) surface alloy.
我们在 Rh(111)单晶上沉积了两层 Sn。沉积后，低能电子衍射（LEED）未显示出有序结构。我们在 420 K 的低压氧气气氛中氧化了所得系统。然后逐渐加热氧化后的样品，以研究氧化层的热稳定性。我们通过同步辐射光电子能谱和 LEED 对系统进行了表征。使用铑、锡和氧的价带和芯层光电子能谱研究了 Sn-Rh(111)表面的氧化及其在退火时的行为。在表面上形成了一种低化学计量的 Sn 氧化物。氧化过程不会继续进行，以在更高的氧气剂量下形成 SnO(2)。在 970 K 退火导致 Sn 表面氧化物的分解，并形成有序的（√3×√3）R30°Sn-Rh(111)表面合金。
