CRIF:MU: Acquisition of Laser Instrumentation for Ultrafast Raman Measurements

在化学研究仪器和设施：多用户计划（CRIF:MU）的支持下，俄亥俄州立大学化学系将获得飞秒再生放大Ti：蓝宝石激光系统，结合多通道探测系统，进行飞秒受激拉曼光谱实验。该仪器将用于理解化学科学中的几个重要问题，包括(a)从观察到的有机金属化合物、亚硝基烯、碳烯和DNA的光物理和光化学性质中，能量如何在分子的激发态中流动；(b)如何增强有机金属化合物中的电荷注入和传播过程，用于太阳能转换；(c)振动弛豫如何介导核酸的超快内部转化；(d)利用电荷转移态进行DNA光切割的系统中，局域激发态的分子性质是什么。拉曼光谱是研究分子和大分子系统（如DNA）振动光谱的有力工具。光谱将提供这些系统中化学键和周围环境影响的信息。时间分辨拉曼光谱允许研究短寿命光化学物质和激发态，提供能量流和弛豫的动态信息。俄亥俄州立大学化学和生物物理动力学中心的激光拉曼系统将用于本科生和研究生的研究，并为他们提供最先进的设备培训。

With support from the Chemistry Research Instrumentation and Facilities: Multiuser program (CRIF:MU), the Department of Chemistry at Ohio State University will acquire a femtosecond, regeneratively amplified Ti:Sapphire laser system, in conjunction with a multichannel detection system, to perform femtosecond stimulated Raman Spectroscopy experiments. The instrumentation will be used to provide understanding to several important problems in chemical science, including (a) how energy flows in the excited states of molecules, from the observed photophysical and photochemical properties of organometallic compounds, nitrenes, carbenes and DNA; (b) how to enhance charge injection and propagation processes in organometallic compounds for solar energy conversion; (c) how vibrational relaxation mediates ultrafast internal conversion of nucleic acids; and (d) what the molecular nature of the localized excited state is in systems used in the photocleavage of DNA by charge transfer states.Raman spectroscopy is a powerful tool for studying vibrational spectra in molecules and macromolecular systems such as DNA. The spectra will provide information on chemical bonding and the effect from the surrounding environment in these systems. Time resolved Raman spectroscopy allows the study of short lived photochemical species and excited states providing dynamical information on energy flow and relaxation as well. The laser Raman system in the Center for Chemical and Biophysical Dynamics at Ohio State will be used in research by undergraduates and graduate students and provide them training with state-of-the-art equipment.