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

实验物理化学计划支持亚利桑那州立大学的Timothy Steimle继续研究含金属的瞬时小分子的几何和分子性质。永久电偶极矩和磁偶极矩将被确定。将分析磁性、超精细和核电四极相互作用，并与偶极矩相结合，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：(1)检测和表征被怀疑是简单的有机金属反应产物的小型多原子过渡金属化合物；(2)第一个过渡金属二聚体的塞曼研究；(3)气相氮化镓的检测和表征。超音速分子束样品将使用激光烧蚀/反应方案产生，并将记录在静电场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仪将被开发用于氮化镓束流的诊断。过渡金属体系对催化、表面化学、配位场理论以及最终对化学反应的电子和几何要求的理解具有重要意义。对氮化镓的特殊研究可能最终证明对半导体行业有用。

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.