Experimental Characterization of Clusters

William Weltner博士得到了The 实验物理化学计划，以调查 小金属簇的物理性质， 半导体、碳和硅， 温度惰性气体基质。 初步实验 这些研究中使用的技术包括光谱学 和ESR/ENDOR光谱。 由自旋组成的大量实验数据 多重性，对称性，光学跃迁，振动 频率，g-张量元素，超精细分裂， 零场参数和交换耦合常数将是 用于表征低温基质孤立簇 以下类型：1）过渡族和稀土族 金属、中性粒子和离子; 2）碳、硅和 碳化硅，中性和离子; 3）离子团簇， 无机反铁磁性和铁磁性晶体， 二氟化锰; 4）贵金属微粒;和 5)小金属簇与氧的反应产物， 氢和一氧化碳。 电子自旋共振和振动光谱的一个广泛的计划， 远红外线被提议允许观察 具有大的零场分裂的过渡金属簇。

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.