Experimental and Theoretical Investigations of Surface Photochemistry

该奖项由特别项目办公室颁发， 材料合成与加工化学部 倡议该研究是一项实验和 从理论上理解表面的存在 影响被吸附分子的光化学性质。具体 目标是使用实验测量和理论 模拟，以了解基板如何影响 光解离吸附的分子中的键，并 研究各种反应途径之间的分支 取决于这一基本步骤。 将进行实验 碘甲烷和碘氰化物，其气相 光解离动力学是众所周知的，吸附在 氧化镁、二氧化钛和金，代表绝缘体， 半导体和金属。表面分析，质量 光谱法和基于气相激光的 光谱测量将被用来确定 反应途径之间的分支和能量含量 从表面喷射出的光碎片。 %%% 表面处理领域的科学问题 光化学与材料问题广泛相关， 光辅助沉积，光刻胶，表面 光降解、光刻和激光， 等离子体辅助蚀刻。

This award is made by the Office of Special Projects in the Chemistry Division under the Materials Synthesis and Processing Initiative. The research is a combined experimental and theoretical effort to understand how the presence of a surface influences the photochemistry of an adsorbed molecule. Specific objectives are to use experimental measurements and theoretical simulations to understand how the substrate affects the photodissociation of a bond in an adsorbed molecule and to investigate how the branching among various reaction pathways depends on this elementary step. Experiments will be carried out on methyl iodide and iodine cyanide, whose gas-phase photodissociation dynamics are well known, adsorbed on magnesia, titania and gold, representing an insulator, a semiconductor, and a metal. Surface analysis, mass spectrometry, and gas phase laser-based spectroscopicmeasurements will be employed to determine the branching among reaction pathways and the energy content of photofragments ejected from the surface. %%% The scientific issues addressed in the field of surface photochemistry are broadly relevant to such materials issues as photoassisted deposition, photoresists, surface photodegradation, photolithography and laser- and plasma-assisted etching.