Laser Spectroscopy Experiments in Advanced Undergraduate Chemistry Laboratories

高级本科化学实验室的激光光谱实验

• 批准号: 9650233
• 负责人: Jeffrey Gray
• 金额: $ 1.25万
• 依托单位: Ohio Northern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9650233&HistoricalAwards=false
• 关键词: Laser; Spectroscopy; Experiments; Advanced; Undergraduate

Laser-based instruments for optical spectroscopy provide new and exciting experiences for students in undergraduate physical chemistry and analytical chemistry courses. This project incorporates miniature pulsed Nd:YAG and tunable dye lasers into several experiments designed to illustrate key features of molecular structure and dynamics. Students are using lasers to record spectra with much higher resolution than is offered by traditional spectroscopic instruments. Fine structure observed in laser-based spectra reveal couplings between molecular motions that students often struggle to visualize. Time-resolved laser-induced-fluorescence studies illustrate the competition between radiative and nonradiative relaxation mechanisms. Multiphoton excitation and resonance-ionization spectroscopy using short pulses can introduce fast electro-optic technology into physical and analytical chemistry courses. Laser Raman spectroscopy complements existing nuclear magnetic resonance, gas chromatograph/mass spectroscopy, and Fourier-transform infrared capabilities for chemical identification in synthesis courses. Students engaged in undergraduate research gain hands-on experience with individual hardware components in modular instrument configurations. The presence of modern spectroscopy in the undergraduate curriculum strongly enhances student preparation for advanced-degree programs in chemistry, medicine, and engineering.

基于激光的光谱仪器为本科生化学和分析化学课程的学生提供了新的令人兴奋的体验。该项目将微型脉冲ND：YAG和可调染料激光器结合到了几个实验中，旨在说明分子结构和动力学的关键特征。学生正在使用激光记录比传统光谱仪器提供的分辨率要高得多的光谱。在基于激光的光谱中观察到的精细结构揭示了学生经常难以可视化的分子运动之间的耦合。时间分辨激光诱导的荧光研究说明了辐射和非辐射弛豫机制之间的竞争。使用短脉冲可以将快速的电彩技术引入物理和分析化学课程中，多光子激发和共振离子化光谱可以引入快速的电磁技术。激光拉曼光谱法补充了现有的核磁共振，气相色谱/质谱和傅立叶转换红外功能，用于合成课程中的化学鉴定。 从事本科研究的学生可以通过模块化仪表配置获得单个硬件组件的动手经验。本科课程中现代光谱学的存在强烈增强了学生为化学，医学和工程领域的高级课程准备的准备。