Purchase of Equipment for Picosecond Domain Measurements

北卡罗来纳大学教堂山分校化学系正在申请资金，用于购买皮秒激光设备以及辅助电子和光学设备。这些收购将补充目前需要皮秒时间分辨率的多个项目的研究能力，例如，瞬态吸收，光驱动事件的动力学和材料非线性光学特性的表征。利用该设备进行的研究包括：1)光诱导过渡金属配合物中的电子和能量转移。2)多肽组装中的定向电子和能量转移。聚合物溶剂中的电子转移速率：慢溶剂偶极子。具有最佳非线性光学响应的聚合物层状超结构玻璃。短寿命不饱和金属有机配合物的瞬态吸收光谱表征。6)弱束缚配合物中短寿命里德堡态的多光子电离和实时动力学。该系统将提供给北卡罗来纳大学科学界的所有成员。所要求的仪器都将与在国防部激光实验室组装的皮秒设备相结合，该实验室是一个自1975年以来运行的多用户设施。皮秒激光光谱学是一种研究化学反应和化学动力学中发生的非常快速（1/ 1000,000,000,000秒）分子过程的方法。这类研究为人们提供了有关化学反应如何进行的分步细节的准确信息，并经常提供有关如何改变化学过程以产生不同的产品或使给定过程更有效的信息。

The Department of Chemistry at the University of North Carolina at Chapel Hill is requesting funds for the purchase of picosecond laser equipment and ancillary electronic and optical devices. These acquisitions will supplememt present research capabilities for a multiplicity of programs requiring picosecond time resolution, for example, transient absorption, dynamics of photo-driven events and characterization of nonlinear optical properties of materials. Included in the research proposed with this equipment are: 1) Light induced electron and energy transfer in transition metal complexes. 2) Directed electron and energy transfer in peptide assemblies. 3) Electron transfer rates in polymeric solvents: slow solvent dipoles. 4) Glasses of polymeric layered ultra-structure for optimum nonlinear optical responses. 5) Characterization of short-lived unsaturated organometallic complexes using transient absorption spectroscopy. 6) Multiphoton ionizationn via short lived Rydberg states and real time dynamics in weakly bound complexes. The system will be available to all members of the UNC scientific community. The instruments requested will all be conjoined with picosecond equipment assembled in the Department's Laser Laboratory, a multiuser facility operating since 1975. %%% Picosecond laser spectroscopy is a method for studying the very rapid ( 1/1,000,000,000,000 of a second) molecular processes that occur in chemical reactions and chemical dynamics. Such studies give one accurate information about the step-by-step details of how a chemical reaction proceeds and often give information about how a chemical process can be altered in order to give different products or make a given process more efficient.