CCLI-EMD: Development of Low-Cost Laser Spectroscopy Experiments for Physical Chemistry

美国高等院校的物理化学教学实验室急需现代化。他们不仅缺乏现代化的设备，而且课堂上的许多主题也没有得到实验室部分的加强。这个问题很大程度上是由于购买光谱设备（如激光器）所涉及的费用。在这个项目中，我们正在开发几个实验室模块，这些模块将利用新一代的蓝色和近紫外二极管激光器，这些激光器可以作为物理化学实验的低成本光谱源。计划的模块涵盖以下主题：激光拉曼光谱，激光散射以监测颗粒大小，碱金属原子的激光电离，以及测量激发态寿命的发光衰减。以前利用蓝色二极管激光器检查光电效应、激光诱导荧光和氩原子的电子光谱的实验也正在发展成完整的模块。与设备配套的教学模块正在作为传统的实验室和基于探究的活动进行开发。合作机构将在模块开发过程中对其进行测试。一个商业供应商也将成为合作伙伴，将这些实验模块开发成低成本的仪器包，供那些无法自己构建这些实验的人使用。

Physical chemistry instructional laboratories at colleges and universities in the United States are in need of modernization. Not only do they lack modern equipment, but many of the topics in the lecture are not reinforced by the laboratory component. The problem is largely due to the expense involved in purchasing spectroscopic equipment such as lasers. In this project we are developing several laboratory modules which will utilize new generations of blue and near-UV diode lasers that can serve as low-cost spectroscopy sources for physical chemistry experiments. The planned modules cover the following topics: laser Raman spectroscopy, laser light scattering to monitor particle size, laser ionization of alkali metal atoms, and luminescence decay to measure excited state life times. Previous experiments that utilize the blue diode lasers which examine the photoelectric effect, laser-induced fluorescence, and electronic spectroscopy of argon atoms are also being developed into full modules. The instructional modules to go along with the equipment are being developed both as traditional laboratories and inquiry-based activities. Partner institutions will test the modules as they are developed. A commercial vendor will also be a partner to develop these experimental modules into low-cost instrumental packages for those who are unable to build these experiments on their own.