Modular and Versatile Spectroscopy Experiments for Physical Chemistry Laboratory

该提案概述了一系列模块化实验，这些实验将在两个方面帮助圣十字物理化学实验室“现代化”。第一个含义反映了内容的变化，从几乎完全涵盖热力学和动力学的“经典”宏观物理化学主题到量子力学和统计力学的“现代”微观主题。这种变化与物理化学讲座课程中所涵盖的主题顺序平行。“现代化”也用于表示“用能够提供更多服务年数的仪器来替换现有的过时设备”。 提出了三组实验。第一次重温原子发射光谱实验室，学生在普通化学。在涵盖原子电子结构理论的量子力学处理后，学生将准备好真正欣赏发射的量子化，并能够定量预测频率，定性理解发射光谱中观察到的强度。第二组实验室研究双原子分子和CHaXb分子的振动光谱。这些测量涉及使用红外吸收和拉曼光谱。一个完整的群理论正常模式分析是用来关联他的光谱跃迁与特定的正常振动。最后一组实验室使用分子碘中的电子跃迁的研究来获得对双原子势能曲线的直观理解。紫外-可见吸收光谱、激光诱导荧光光谱和多光子电离光谱的解释将有助于实现这一重要目标。 所要求的设备足以进行拟议的测量，但绝不限于此。氮泵浦染料激光器、检测器和计算机接口的数据采集电子设备提供了一套通用的组件，这些组件可以以多种方式布置以实现不同类型的光谱学。化学部门要求的FT-拉曼附件完成了这些实验室所需的设备清单。

This proposal outlines a series of modular experiments that would help "modernize" the Holy Cross physical chemistry laboratories in two respects. The first meaning reflects the change in content from covering almost exclusively the "classical" macroscopic physical chemistry topics of thermodynamics and kinetics to the "modern" microscopic subjects of quantum and statistical mechanics. This change parallels the sequence of topics covered in the physical chemistry lecture courses. "Modernize" is also used to mean "replace the existing outdated equipment" with instrumentation that will provide many additional years of service. There are three groups of experiments that are proposed. The first revisits the atomic emission spectroscopy laboratory that the students perform in general chemistry. After covering the quantum mechanical treatment of atomic electronic structure theory, the students will be ready to truly appreciate the quantization of the emission and will be able to quantitatively predict the frequencies and qualitatively understand the intensities observed in the emission spectra. The second set of laboratories investigates the vibrational spectroscopy of diatomic as well as CHaXb molecules. These measurements involve use both infrared absorption and Raman spectroscopy. A full group theoretical normal-mode analysis is used to correlate he spectral transitions with specific normal vibrations. The last group of laboratories uses a study of electronic transitions in molecular iodine to gain an intuitive understanding of diatomic potential energy curves. The interpretation of UV-Visible absorption, laser-induced fluorescence, and multiphoton ionization spectra will help accomplish this important goal. The equipment requested is sufficient for but in no way limited to making the proposed measurements. The nitrogen-pumped dye laser, detectors, and the computer-interfaced data acquisition electronics provide for a versatile set of components that can be arranged in many ways to accomplish d ifferent types of spectroscopy. The requested FT-Raman attachment for the chemistry department completes the list of equipment needed for these laboratories.