Schlapka A, Lischka M, Gross A, Käsberger U, Jakob P
Physik-Department, Technische Universität München, 85747 Garching, Germany.
Phys Rev Lett. 2003 Jul 4;91(1):016101. doi: 10.1103/PhysRevLett.91.016101. Epub 2003 Jun 30.
By studying the adsorption of CO on up to 30 layers of Pt deposited on Ru(0001) the influence of surface strain on the adsorption energy has been disentangled from the residual chemical interaction with the substrate. While the electronic influence of the substrate has largely vanished for three Pt layers, the effect of surface strain due to the 2.5% lattice mismatch of Pt and Ru remains initially intact and is only gradually released for n>/=5 Pt layers. Electronic structure calculations confirm the experimental observations, in particular, the dramatic decrease of the CO adsorption energy on a single Pt layer which is caused by the strong Pt-Ru interlayer coupling.
通过研究一氧化碳在沉积于Ru(0001)上多达30层的铂上的吸附情况，表面应变对吸附能的影响已从与衬底的残余化学相互作用中区分出来。虽然对于三层铂来说，衬底的电子影响已基本消失，但由于铂和钌2.5%的晶格失配所导致的表面应变效应最初仍然存在，并且仅在n≥5层铂时才逐渐释放。电子结构计算证实了实验观察结果，特别是单层铂上一氧化碳吸附能的急剧下降，这是由强烈的铂-钌层间耦合引起的。
