Experimental Studies of the Vibrational Dynamics of Adsorbates

这个研究项目，支持在分析和表面 化学计划，将解决寿命和能源 振动激发态分子转移机理 吸附在半导体和金属表面上。 将制备定义明确的吸附物表面系统， 其特征在于在超高真空和溶液中，和 吸附物的选定振动将被激发， 超短红外激光脉冲 振动的演化 将用相干时间分辨激光监测激发 表面光谱法 相互吸附的机制， 振动-声子和振动-电子能量转移将 被探索。 这项工作最初将集中于研究 H/Si（111）和（100）吸附质中的能量转移 系统，以及对分子CO吸附在电化学 接口。 %%% 吸附分子之间的能量转移动力学， 固体表面控制表面化学中的反应性。 这 研究项目将探索吸附物表面的细节 能源转移，目的是了解 这种工艺及其与半导体加工的相关性， 电化学系统和多相催化。 强大 激光光谱方法将用于研究分子 吸附在充分表征的半导体和金属上 表面。

This research project, supported in the Analytical and Surface Chemistry Program, will address the lifetimes and energy transfer mechanisms of vibrationally excited molecular adsorbates on semiconductor and metallic surfaces. Well-defined adsorbate-surface systems will be prepared and characterized in ultra high vacuum and in solution, and selected vibrations of the adsorbates will be excited by ultrashort IR laser pulses. Evolution of the vibrational excitation will be monitored with coherent time-resolved laser surface spectroscopy methods. Mechanisms of inter-adsorbate, vibration-phonon, and vibration-electronic energy transfer will be explored. The work will concentrate initially on the study of energy transfer in the H/Si(111) and (100) adsorbate systems, as well as on molecular CO adsorbed at electrochemical interfaces. %%% The dynamics of energy transfer between adsorbed molecules and solid surfaces controls reactivity in surface chemistry. This research project will explore the details of adsorbate-surface energy transfer, with the goal of developing an understanding of this process and its relevance to semiconductor processing, electrochemical systems, and heterogeneous catalysis. Powerful laser spectroscopic methods will be used to study molecular adsorbates on well-characterized semiconductor and metallic surfaces.