Experimental and Theoretical Investigations of Surface Photochemistry

该奖项由材料合成和加工倡议下的化学部门特别项目办公室颁发。这项研究是实验和理论的结合，旨在了解表面的存在如何影响被吸附分子的光化学。具体目标是使用实验测量和理论模拟来了解底物如何影响吸附分子中键的光解离，并研究不同反应途径之间的分支如何依赖于这一基本步骤。实验将进行碘化甲酯和碘氰化物，其气相光解动力学是众所周知的，吸附在镁、钛和金上，代表绝缘体、半导体和金属。表面分析、质谱分析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从表面喷射出的光碎片的能量含量。表面光化学领域研究的科学问题与光辅助沉积、光阻剂、表面光降解、光刻、激光和等离子体辅助蚀刻等材料问题广泛相关。

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.