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

美国-捷克斯洛伐克材料研究激发电子态和晶体表面动态过程的衍射研究

• 批准号: 9204023
• 负责人: M. Van Hove
• 金额: $ 1.71万
• 依托单位: Lawrence Berkeley Laboratory
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1997-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204023&HistoricalAwards=false
• 关键词: U.S.; Czechoslovakia; Materials; Research; Diffraction

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.

这个美国-捷克斯洛伐克研究项目由劳伦斯伯克利实验室的 M. A. Van Hove 博士和捷克斯洛伐克科学院物理研究所的 I. Bartos 博士合作，将研究激发电子态的衍射和晶体表面的动态过程。 研究人员将探索金属表面的动态电子过程，这与理解多体效应相关，从而阐明低维系统中电子的行为。 通过将模型光势与实验数据拟合，可以在低能电子的衍射中研究这种非弹性效应。 结果可能有助于揭示真空能级以上未占据态的电子结构，例如过渡金属在接近真空能级的能量下通常的非弹性平均自由程。 这项工作还应该有助于理解吸附物表面光化学动力学的寿命。 另一个好处是更好地获取非常轻的元素，主要是氢，它可以诱导表面重建。 这些结果对于理解催化、晶体生长和纳米结构的性质非常重要。 该材料科学研究项目通过使美国和东欧的领先专家在共同感兴趣和能力强的领域结合互补人才和汇集资源，实现了推进科学知识的计划目标。