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.

实验物理化学项目支持亚利桑那州立大学的Timothy Steimle继续研究含金属瞬态小分子的几何和分子特性。永久电偶极矩和磁偶极矩将被确定。磁超精细和核电四极相互作用将被分析，并与偶极矩相结合，以构建基于分子轨道的化学键趋势描述。提出了三个实验项目：(i)检测和表征怀疑是简单模式有机金属反应产物的小多原子过渡金属化合物；（ii）塞曼对过渡金属二聚体的首次研究；（三）气相氮化镓的检测与表征。超音速分子束样品将使用激光烧蚀/反应方案产生，并记录静电和磁场存在下的高分辨率激光诱导荧光光谱。采用共振增强多光子电离技术的飞行时间质谱法将用于氮化镓光束诊断。过渡金属体系在催化、表面化学、配体场理论以及最终对化学反应性的电子和几何要求的理解方面具有重要意义。对氮化镓的特殊研究最终可能对半导体工业有用。