英文原版-在氦自旋回波实验中的相互吸附力和相干散射.pdfVIP

英文文献学习素材 声明：素材来源于互联网公共免费领域，由上传者搜集、整理、编译，旨在帮助科 研领域人士扩展学习途径，丰富科研素材。 中文摘要 在氦自旋回波实验中的相互吸附力和相干散射 在动力学系统研究中，氦原子从表面上的一组吸附物上以相干方式 散射。结果提供了相互作用的吸附物的共同行为的信息，因此包括吸 附物-基体和吸附物-吸附物相互作用的效果。在这里，我们讨论一种 方法来分离吸附物之间相互作用的效果与与基体的效果。结果给出了 一个观测的近似，如果散射是不相干的，就可以从实验中获得信息， 从而更清楚地区分远距离的吸附物间力和由局部晶格势和相关热激发 产生的短程效应。该方法在强烈的吸附物间相互作用的系统中被讨论， 即铜(111)表面上扩散的钠原子。 Inter-adsorbate forces and coherent scattering in helium spin-echo experiments. David J. Ward,1, ∗ Arjun Raghavan,1,2 Anton Tamt¨ogl,1,3 Andrew P. Jardine,1 Emanuel Bahn,1 John Ellis,1 Salvador Miret-Art´es,4 and William Allison1 1 Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom 2Department of Physics, University of Illinois at Urbana-Champaign - 1110 W. Green St., Urbana, IL 61801 3Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria 4 CSIC Institute of Fundamental Physics, Serrano 123, Madrid 28006, Spain In studies of dynamical systems, helium atoms scatter coherently from an ensemble of adsorbates as they diffuse on the surface. The results give information on the co-operative behaviour of inter- acting adsorbates and thus include the effects of both adsorbate-substrate and adsorbate-adsorbate interactions. Here, we discuss a method to disentangle the effects of interactions between adsorbates from those with the substrate. The result gives an approximation to observations that would be obtained if the scattering was incoherent. Information from the experiment can therefore be used to distinguish more clearly between long-range inter-adsorbate forces and the short range effects arising from the local lattice potential and associated thermal excitations. The method is discussed