Enhancement of the Undergraduate Physical Chemistry Laboratory: A Versatile and Novel Pulsed Laser-Based System for Nanosecond Time-Resolved Luminescence Studies in Molecular Phot

化学（12）基于超短激光脉冲的实验在实验物理化学中已经变得无处不在。 为了让学生了解最新的发展，并获得“动手”的经验，这些技术，访问一个脉冲激光为基础的系统与泵浦探测能力的发光研究是很重要的。 在这个项目中，这样做的仪器被纳入本科物理化学实验室课程。该系统由Q开关YAG激光器组成，该激光器在近紫外（355 nm）或中紫外（266 nm）具有3 ns（4-8 mJ）脉冲的谐波产生，从而在各种分子中提供激发。快速发光由灵敏的PIN光电二极管检测器检测，具有400 ps的响应，并由1GHz带宽（1 GHz）的数字示波器数字化。YAG激光器还用于泵浦现有的可调谐染料激光器，其探测器输出使用基于玩具火车轨道和引擎的廉价且新颖的光学延迟线从0到50 ns暂时延迟。一组实验的本科物理化学实验室，测量一系列芳烃的荧光寿命，并直接监测系统间的穿越过程的纳秒时间尺度上使用光学延迟三重态-三重态吸收正在调整和实施，与增强。改编的材料来自化学教育文献（J.化学教育）和研究文献。激光设备也被引入无机、有机和高级有机课程，这些课程通常与激光化学无关。 这大大扩大了该项目的影响。 评价和评估活动由一名在激光化学方面有经验的外部评价员和一名化学教育专家协助进行。 研究结果将通过专门的网页和提交给《化学教育杂志》的论文进行传播。

Chemistry (12) Ultrashort laser pulse-based experiments have become ubiquitous in experimental physical chemistry. In order for students to understand recent developments and obtain "hands on" experience with such techniques, access to a pulsed laser-based system with pump-probe capability for luminescence studies is important. In this project, the instrumentation to do this is being incorporated into the undergraduate physical chemistry laboratory curriculum. The system consists of a Q-Switched YAG laser with harmonic generation in either the near-UV (355 nm) or mid-UV (266 nm) with a 3 ns (4-8 mJ) pulse, thus providing excitation in a variety of molecules. The fast luminescence is detected by a sensitive PIN photodiode detector with 400 ps response and digitized by an ultrahigh bandwidth (1 GHz) digital oscilloscope. The YAG laser is also used to pump an existing tunable dye laser, whose probe output is temporally delayed from 0 to 50 ns using an inexpensive and novel optical delay line based on a toy train track and engine. A set of experiments for the undergraduate physical chemistry laboratory that measure fluorescence lifetimes of a series of aromatic hydrocarbons and also directly monitor intersystem crossing processes on the nanosecond time scale using optically delayed triplet- triplet absorption are being adapted and implemented, with enhancements. The adapted materials come from both the chemical education literature (J. Chemical Education) and from the research literature. The laser equipment is also being introduced into inorganic, organic and advanced organic courses, courses not normally associated with laser chemistry. This considerably broadens the impact of this project. Evaluation and assessment activities are being assisted by an external evaluator, experienced in laser chemistry, and by a chemical education specialist. The results will be disseminated through dedicated Web pages and papers submitted to the Journal of Chemical Education.