Resonance Raman Studies of Excited-State Structure and Dynamics

在这个项目中的物理化学计划的 化学部，理查德·马西斯教授的大学 位于加州伯克利的研究中心将结合使用拉曼和 飞秒激光方法试图阐明分子 基态和激发态分子动力学 凝聚相光化学和光生物学反应。 原子核运动的特定模式动力学 在光激发之后，将立即在 飞秒的时间尺度，和关键的中间体， 光化学反应将被识别和表征 使用皮秒拉曼和吸收光谱。 的类型 包括氢转移反应， 视觉色素异构化，光致变色异构化，和 细菌光合反应中心的电子传递。 %%% Mathies教授计划的这些研究旨在了解 在地球上发生的物理和化学过程 当光激发特定成分时，液体或固体状态。 拟议的系统和技术组合应有助于 对原子运动的完整描述 发生在化学反应中，从早期的动力学 的瞬态激发物种的弛豫 平衡产物 这项研究包括以下研究： 涉及光敏色素的生物系统。

In this project in the Physical Chemistry Program of the Chemistry Division, Professor Richard Mathies of the University of California, Berkeley, will use a combination of Raman and femtosecond laser methods to try to elucidate the molecular mechanism and the ground and excited-state molecular dynamics of condensed phase photochemical and photobiological reactions. The mode-specific dynamics of nuclear motion that occur immediately after optical excitation will be followed on a femtosecond time scale, and key intermediates in the photochemical reactions will be identified and characterized using picosecond Raman and absorption spectroscopy. The types of reaction to be explore include hydrogen shift reactions, visual pigment isomerization, photochrome isomerization, and electron transfer in bacterial photosynthetic reaction centers. %%% These planned studies by Professor Mathies aim at understanding the physical and chemical processes that take place in the liquid or solid state when light excites specific constituents. The proposed combination of systems and techniques should aid in developing a complete description of the atomic motions which occur during chemical reactions, from the early dynamics of the transient excited species to those of the relaxed equilibrium products. Included in this research are studies of biological systems involving light-sensing pigments.