Experimental and Theoretical Investigation of Photo- dissociation on MgO(001)

这笔资金由化学特别项目和材料研究部共同资助，为教授的研究提供支持。西北大学的斯泰尔和韦茨。本研究的目的是从实验和理论上研究吸附在单晶绝缘体表面的小分子的光解离动力学。这些信息对于理解气固界面的光化学是很重要的。除了研究吸附的分子物种的吸附和表面化学外，实验计划还将重点测量光解离碎片的角分布、动能分布以及转动和振动分布。在气相光解测量的基础上，选择所要研究的分子作为快速直接和预解离光解机理的代表性例子。它们还提供了可用于高灵敏度检测的原子和分子片段以及理论描述。选择氧化镁吸附表面是因为它的绝缘性能、易于处理和表征以及其化学稳定性。将要开发的理论模型将旨在计算实验测量的碎片分布。

This grant, funded jointly by Special Projects in Chemistry and the Division of Materials Research provides support for the research of Profs. Stair and Weitz at Northwestern University. The objective of the research is to study, both experimentally and theoretically, the photodissociation dynamics of small molecules adsorbed on single-crystal insulator surfaces. Such information is of importance to the understanding of photochemistry at the gas-solid interface. In addition to studies of the adsorption and surface chemistry of the adsorbed molecular species, the experimental program will also focus on measurements of the angular distribution, the kinetic energy distribution and the rotational and vibrational distributions of the photodissociated fragments. The molecules to be studied were selected as representative examples of rapid direct and predissociative photodissociation mechanisms on the basis of gas phase photodissociation measurements. They also provide both atomic and molecular fragments that are amenable to high sensitivity detection as well as theoretical description. The magnesium oxide adsorbant surface was selected for its insulating properties,ease of handling and characterization and its chemical stability. Theoretical models to be developed will aim at calculating the experimentally measured fragment distributions.