U.S.-Czechoslovakia Materials Research on Diffraction Studies of Excited Electron States and of Dynamic Processes on Crystal Surfaces

这个美国和捷克斯洛伐克的研究项目，A. 劳伦斯伯克利实验室的货车霍韦和I.巴托斯 捷克斯洛伐克科学院物理研究所 将研究激发电子的衍射 状态和动态过程的晶体表面。 的 研究人员将探索动态电子过程， 金属表面，这是相关的理解许多- 将阐明电子行为的体效应 在低维系统中。 这种非弹性效应将 在低能电子衍射中进行研究， 将模型光学势拟合到实验数据。 结果可能揭示电子结构的 真空水平以上的未被占据的状态，例如 过渡金属的通常非弹性平均自由程. 能量接近真空水平。 工作也应该 有助于理解光化学中的寿命 吸附物表面的动力学。 另一益处 能更好地接触到非常轻的元素， 氢，其可以引起表面重构。 这些 结果对于理解催化作用很重要， 晶体生长和纳米结构的性质。 该材料科学研究项目实现了 通过以下方式提高科学知识的计划目标 使美国和东方的领先专家能够 欧洲将联合收割机互补人才，集中资源 在共同感兴趣和有能力的领域。

This US-Czechoslovak research project between Dr. M. A. Van Hove of Lawrence Berkeley Laboratory and Dr. I. Bartos of the Institute of Physics of the Czechoslovakian Academy of Sciences will study diffraction of excited electron states and of dynamic processes on crystal surfaces. The researchers will explore the dynamic electron processes at metal surfaces, which are relevant for understanding many- body effects that will clarify the behavior of electrons in lower-dimensional systems. Such inelastic effects will be studied in the diffraction of low-energy electrons, by fitting model optical potentials to experimental data. Results may shed light on the electronic structure of unoccupied states above the vacuum level, such as the usual inelastic mean free path in transition metals at energies close to the vacuum level. The work also should benefit the understanding of lifetimes in photochemistry cynamics at surfaces with adsorbates. A further benefit would be better access to very light elements, principally hydrogen, which can induce surface reconstruction. These results would be important in understanding catalysis, crystal growth and properties of nanostructures. This research project in materials science fulfills the program objective of advancing scientific knowledge by enabling leading experts in the United States and Eastern Europe to combine complementary talents and pool resources in areas of strong mutual interest and competence.