Optical Stark and Zeeman Studies of Gas-Phase Metal Containing Molecules

气相含金属分子的光学斯塔克和塞曼研究

• 批准号: 9710174
• 负责人: Timothy Steimle
• 金额: $ 27.17万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2000-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9710174&HistoricalAwards=false
• 关键词: Optical; Stark; Zeeman; Studies; Gas

The Experimental Physical Chemistry Program supports Timothy Steimle of Arizona State University in his continuing investigations into the geometrical and molecular properties of small metal-containing transient molecules. The permanent electric and magnetic dipole moments will be determined. The magnetic hyperfine and nuclear electric quadrupole interactions will be analyzed and combined with the dipole moments to construct a molecular orbital-based description of trends in chemical bonding. Three experimental projects are proposed: (i) the detection and characterization of small polyatomic transition metal-containing compounds suspected to be products of simple model organometallic reactions; (ii) the first Zeeman study of transition metal dimers; and (iii) the detection and characterization of gas-phase gallium nitride. Supersonic molecular beam samples will be generated using a laser ablation/reaction scheme and high resolution laser-induced fluorescence spectra in the presence of static electric and magnetic fields will be recorded. Time-of-flight mass spectrometry employing resonance enhanced multi-photon ionization techniques will be developed for the gallium nitride beam diagnostics. The transition metal systems are important having relevance to catalysis, surface chemistry, ligand field theory and ultimately to the understanding of electronic and geometrical requirements for chemical reactivity. The particular study of gallium nitride may eventually prove useful to the semiconductor industry.

实验物理化学计划支持亚利桑那州立大学的蒂莫西·史蒂姆（Timothy Steimle），他对含有小金属的瞬态分子的几何和分子特性进行了持续研究。 将确定永久性电和磁偶极矩。 将分析磁性超细和核电四极相互作用，并与偶极矩结合，以构建基于分子轨道化学键合的分子轨道描述。 提出了三个实验项目：（i）含有简单模型有机金属反应的产物的小多原子金属化合物的检测和表征； （ii）第一个Zeeman过渡金属二聚体研究； （iii）气相氮化岩的检测和表征。 将使用激光消融/反应方案生成超音速分子束样品，并在存在静态电场和磁场的情况下高分辨率激光诱导的荧光光谱。 使用共振增强的多光子电离技术的飞行时间质谱法将开发用于氮化炮束诊断。 过渡金属系统与催化，表面化学，配体场理论以及对化学反应性的电子和几何需求的理解有关。 对氮化碳的特殊研究最终可能对半导体行业有用。