Vicinal surfaces are important in surface science, as they show interesting electronic structures and reactivities due to the steps. In this paper the adsorption and desorption of carbon monoxide on the stepped Rh(553) surface decorated with Ni is reported. With 0.1 to 0.3 monolayer Ni on Rh(553) one and two atoms broad Ni wires along the Rh steps are formed. The adsorption and desorption of carbon monoxide on these surfaces is investigated using thermal desorption spectroscopy (TDS) and reflection absorption infra red spectroscopy (RAIRS). TDS shows a marked change from just one broad TDS peak on pure Rh(553) to 4 distinct peaks with increasing Ni decoration. RAIRS shows that already at 0.1 monolayer Ni the CO adsorption states on bridge sites on the Rh step atoms are completely quenched. In addition it is shown that with Ni films up to 3 monolayer the on top adsorption sites for CO on Ni are preferred over the bridge and hollow adsorption sites in contrast to what is known from the Ni(111) surface.

中文翻译：

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CO在Ni修饰的阶梯Rh(553)上的吸附和解吸

邻位表面在表面科学中很重要，因为它们由于台阶而显示出有趣的电子结构和反应性。本文报道了一氧化碳在装饰有 Ni 的阶梯式 Rh(553) 表面上的吸附和解吸。在 Rh(553) 上有 0.1 到 0.3 个单层 Ni，沿着 Rh 台阶形成一个和两个原子宽的 Ni 线。使用热解吸光谱 (TDS) 和反射吸收红外光谱 (RAIRS) 研究一氧化碳在这些表面上的吸附和解吸。TDS 显示从纯 Rh(553) 上的一个宽 TDS 峰显着变化到 4 个不同的峰，随着 Ni 装饰的增加。RAIRS 表明，在 0.1 单层 Ni 时，Rh 阶梯原子上桥位上的 CO 吸附状态已完全淬灭。