U.S.-France Cooperative Research: Infrared Synchrotron Radiation Studies of Adsorbate-Substrate Vibrations

该奖项将支持布鲁克海文国家实验室的Gwyn Williams博士和法国泰国实验室的Paul Dumas博士在物理学方面的合作研究。该项目的目标是研究金属和半导体表面吸附的低频模式。红外同步辐射光源的最新发展已经证明了它们作为低频吸收-衬底振动模式的探测器的用途。这种被吸附原子和分子的低频振动包含了关于吸附物质-底物键的直接信息，该信息控制着吸附物质的稳定性、反应性和流动性。很少有技术可以访问这些振动。电子能量损失谱(EELS)以其特别好的灵敏度提供了最丰富的信息。然而，它的分辨率限制了它在线形和同位素位移研究以及在更高压力下工作的使用。在这个项目中，美国和法国调查人员将使用布鲁克海文的新红外同步辐射设施，结合他们的专业知识，对低频率区域的过渡层表面和贵金属和半导体进行EELS和EELS研究(在法国一侧)和表面反射-吸收光谱(在美国一侧)。威廉姆斯博士是国际公认的同步辐射光谱学的领导者，负责布鲁克海文的远红外光束线的开发。Paul Dumas博士发展了一个杰出的表面振动实验室，包括红外、电子能量损失以及拉曼和激光光谱的研究。这项研究的结果有望有助于理解表面吸附物的几何和成键，这仍然是表面科学中最重要的问题之一。

This award will support collaborative research in physics between Dr. Gwyn Williams, Brookhaven National Laboratory and Dr. Paul Dumas, Laboratoire de Spectrochimie Infrarouge et Raman, Thais, France. The objective of the project is to study low frequency modes of adsorbates on metal and semiconductor surfaces. Recent developments in infrared synchrotron radiation sources have led to the demonstration of their utility as a probe of low frequency absorbate-substrate vibrational modes. Such low frequency vibrations of adsorbed atoms and molecules contain direct information on the adsorbate-substrate bond, which controls the stability, reactivity and mobility of adsorbates. Few techniques can access these vibrations. Electron Energy Loss spectro-scopy (EELS) has provided the most abundant information due to its particularly good sensitivity. However, its resolution has limited its use for line-shape and isotopic shift studies, as well as for work at higher pressures. In this project, the US and French investigators will use the new infrared synchrotron radiation facility at Brookhaven to perform both and EELS studies on surfaces of transition and noble metals and semiconductors in the low frequency region, combining their expertise EELS (on the French side) and surface reflection-absorption spectroscopy (on the US side). Dr Williams is internationally recognized as a leader in synchrotron radiation spectroscopy and is responsible for the development of the far-infrared beamline at Brookhaven. Dr. Paul Dumas has developed an outstanding surface vibrational laboratory, including research on infrared, electron energy loss, and Raman and laser spe- ctroscopies. Results of this research are expected to contribute to the understanding of the geometry and bonding of adsorbates on surfaces, still one of the most important problems in surface science.