Experimental Characterization of Clusters

威廉·韦尔特纳博士得到了实验物理化学计划的资助，该计划研究被困在低温惰性气体基质中的金属、半导体、碳和硅的小团簇的物理性质。这些研究中使用的主要实验技术包括光学光谱和ESR/Endor光谱。包括自旋多重性、对称性、光学跃迁、振动频率、g张量元、超精细分裂、零场参数和交换耦合常数在内的大量实验数据将被用来表征以下类型的低温矩阵孤立团簇：1)过渡金属和稀土金属、中性和离子的团簇；2)碳、硅和碳化硅、中性物质和离子的簇合物；3)无机反铁和铁磁晶体的离子簇合物，如二氟化锰；4)贵金属微粒；以及5)小金属簇合物与氧、氢和一氧化碳的反应产物。提出了一个扩展的远红外电子自旋共振和振动光谱程序，以便能够观测到具有大零场分裂的过渡金属团簇。

Dr. William Weltner is supported by a grant from The Experimental Physical Chemistry Program to investigate the physical properties of small clusters of metals, semiconductors, carbon and silicon which are trapped in low temperature inert gas matrices. The primary experimental techniques used in these studies include optical spectroscopy and ESR/ENDOR spectroscopy. A large body of experimental data consisting of spin multiplicities, symmetries, optical transitions, vibrational frequencies, g-tensor elements, hyperfine splittings, zero-field parameters, and exchange coupling constants will be used to characterize low temperature matrix isolated clusters of the follow types: 1) clusters of transition and rare-earth metals, neutrals and ions; 2) clusters of carbon, silicon, and silicon carbide, neutrals and ions; 3) ionic clusters of inorganic antiferrro- and ferro-magnetic crystals such as manganese difluoride; 4) microparticles of noble metals; and 5) reaction products of small metal clusters with oxygen, hydrogen and carbon monixide. An extensive program of ESR and vibrational spectroscopy in the far-infrared is proposed to allow the observation of transition metal clusters with large zero-field splittings.