An efficient laser vaporization source for chemically modified metal clusters characterized by thermodynamics and kinetics

Tsugunosuke Masubuchi, Jan F. Eckhard, Kathrin Lange, Bradley Visser, Martin Tschurl, Ulrich Heiz

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish
Article number023104
JournalReview of Scientific Instruments
Volume89
Issue number2
DOIs
StatePublished - 1 Feb 2018
Externally publishedYes

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