Reconstructions on Clean and Absorbate Covered Surfaces

某些表面具有二维周期性，这与从体中直接延续所期望的不同，这种现象被称为重建。在某些情况下，可以通过添加一定量的附着原子来诱导重构。关于这种重排发生的原因和方式的问题是表面科学中最重要的话题。此外，诱导这种效应的可能性有可能为具有新颖和可能非常有用的特性的新材料提供来源。利用具有通道和阻塞的中能量离子散射来研究这种重建表面的几何结构，这是一种强大的、新颖的、高分辨率的表面研究技术。这些研究将与使用同步辐射和反向光电发射的角度分辨光电发射的电子结构研究相辅相成。待研究的体系包括发生在金和铂（110）表面上的重构，以及发生在类似表面上的吸附物诱导的重构。这项研究最终将导致改变表面原子位置的新方法，从而产生具有有用性能的合成表面。

Certain surfaces have a two-dimensional periodicity that differs from that expected from a straight forward continuation from the bulk, a phenomena known as reconstruction. In some cases, a reconstruction can be induced by the addition of controlled amounts of adatoms. Questions about why and how such rearrangements occur represent fundamentally inportant topics in surface science. In addition, the possibility to induce such effects has the potential of providing a source for new materials with novel and possibly very useful properties. A study of geometric structure of such reconstructed surfaces using medium energy ion scattering with channeling and blocking, a powerful, novel, high resolution technique for surface studies will be employed. These studies are to be complemented with studies of the electronic structure using angle resolved photoemission with synchrotron radiation and with inverse photoemission. Among the systems to be studied are the reconstructions that occur on the (110) surfaces of gold and platinum and the adsorbate induced reconstructions that occur on similar surfaces. This research will ultimately lead to new ways of changing the location of atoms on surfaces and thus produce synthetic surfaces with useful properties.