Acquisition of a Continuous-Wave Ring Laser for Recording Electronic Spectra of Gaseous, Metal-Containing Free Radicals

采集连续波环形激光器来记录气态含金属自由基的电子光谱

• 批准号: 0216172
• 负责人: Thomas Varberg
• 金额: $ 21.12万
• 依托单位: Macalester College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0216172&HistoricalAwards=false
• 关键词: Acquisition; Continuous; Wave; Ring; Laser

With this award from the Major Research Instrumentation (MRI) Program, the Department of Chemistry at Macalester College will acquire a continuous-wave ring laser system. This equipment will be used to measure and analyze the optical spectra of second- and third-row transition metal fluorides and oxides. The PI and his undergraduate collaborators will record laser excitation spectra at Doppler-limited resolution in order to determine the vibrational, rotational and fine-structure constants of newly observed molecules. Further work at sub-Doppler resolution utilizing the technique of intermodulated fluorescence will reveal the hyperfine structure of the observed transitions, which is useful for identifying the electronic configurations of the ground and excited states. In addition, the instrumentation will be used as a resource in advanced courses and laboratories in the Chemistry Department. Interest in understanding the complex electronic structure and spectroscopy of small, transition metal-containing molecules in the gas phase continues to grow. With the development of high-resolution and high-power tunable laser sources, spectroscopists can now record and assign spectra that previously were very difficult to acquire or analyze. Such molecules are of practical interest in fields as diverse as astronomy, catalysis, metallurgy and organometallic chemistry. Diatomic molecules containing a transition metal display the simplest form of metal bonding and are therefore relevant as initial models for more complex systems.

有了这一重大研究仪器(MRI)计划的奖励，Macalester学院化学系将获得一种连续波环形激光系统。该装置将用于测量和分析第二和第三排过渡金属氟化物和氧化物的光谱。PI和他的本科合作者将以多普勒有限的分辨率记录激光激发光谱，以确定新观测到的分子的振动、旋转和精细结构常数。利用互调荧光技术在亚多普勒分辨率上的进一步工作将揭示所观察到的跃迁的超精细结构，这有助于识别基态和激发态的电子组态。此外，这些仪器将被用作化学系高级课程和实验室的资源。人们对了解气相中含过渡金属的小分子的复杂电子结构和光谱的兴趣继续增长。随着高分辨率和高功率可调谐激光光源的发展，光谱学家现在可以记录和分配以前很难获取或分析的光谱。这些分子在天文学、催化、冶金和有机金属化学等领域具有实用价值。含有过渡金属的双原子分子表现出最简单的金属成键形式，因此与更复杂系统的初始模型有关。