星团(航天器)
汽化
材料科学
产量(工程)
动力学
反应性(心理学)
金属
化学物理
氧化物
动能
热力学
分析化学(期刊)
物理化学
化学
有机化学
物理
医学
替代医学
病理
量子力学
计算机科学
冶金
程序设计语言
作者
Tsugunosuke Masubuchi,J. F. Eckhard,Kathrin M. Lange,Bradley Visser,Martin Tschurl,Ulrich Heiz
摘要
A laser vaporization cluster source that has a room for cluster aggregation and a reactor volume, each equipped with a pulsed valve, is presented for the efficient gas-phase production of chemically modified metal clusters. The performance of the cluster source is evaluated through the production of Ta and Ta oxide cluster cations, TaxOy+ (y ≥ 0). It is demonstrated that the cluster source produces TaxOy+ over a wide mass range, the metal-to-oxygen ratio of which can easily be controlled by changing the pulse duration that influences the amount of reactant O2 introduced into the cluster source. Reaction kinetic modeling shows that the generation of the oxides takes place under thermalized conditions at less than 300 K, whereas metal cluster cores are presumably created with excess heat. These characteristics are also advantageous to yield “reaction intermediates” of interest via reactions between clusters and reactive molecules in the cluster source, which may subsequently be mass selected for their reactivity measurements.
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