Laser-Based Methods for Laboratory Instruction

这个项目的目标是通过在几个高等本科实验室使用激光作为一种工具，让学生亲身接触到学生难以掌握的基本概念，从而提高本科生的教学质量。这个项目建立在美国化学学会出版物《物理化学：开发动态课程》中报道的激光教育的早期发展以及同行评议的J·化学教育版上的早期研究人员报告的基础上。这些方法适用于我们的计划，该计划强调：(A)涉及与分子的电子和振动性质有关的量子力学理论的基本概念，以及(B)光与分子的相互作用。激光教学从学生从基本部件开始构建激光光谱仪系统开始。学生们使用构建的激光光谱仪来获得和解释拉曼光谱，检验比尔定律，估计溶液中的溶质浓度，确定弱酸的pKa，根据吸收和发射数据构建Jablonski图，确定发射寿命，并通过Stern-Volmer技术检查电子转移猝灭。最后，学生设计、合成和表征用作分子传感器的分子。每年受影响的学生人数约为70人。这些活动以纳秒脉冲激光为中心。

The goal of this project is to enhance the quality of undergraduate instruction by using lasers in several upper undergraduate laboratories as a tool that provides hands-on exposure to fundamental concepts which students have difficulty grasping. This project builds on the earlier developments in laser education reported in the American Chemical Society Publication, Physical Chemistry: Developing a Dynamic Curriculum and by earlier investigators reporting in the peer-reviewed J. Chemical Ed. These methods are adapted to fit our program, which emphasizes: (a) basic concepts involving quantum mechanical theory related to electronic and vibronic properties of molecules and (b) the interaction of light with molecules. Laser education begins with the students building a laser spectrometer system from basic components. Students use the constructed laser spectrometer to obtain and interpret Raman Spectra, examine Beer's Law, estimate solute concentration in solution, determine the pKa of a weak acid, construct Jablonski diagrams from absorption and emission data, determine emission lifetimes, and examine electron transfer quenching by Stern-Volmer techniques. Finally, the students design, synthesize and characterize molecules for use as molecular sensors. The number of students affected is approximately seventy per year. The activities are centered on a nanosecond pulsed laser.