Production of Clusters by Pulsed Laser Vaporization and their Trapping in Rare Gas Matrices
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Publisher:Ohio State University
One of the techniques which led recent progress in studies of bare metal clusters utilizes laser vaporization. Typically, metal or other material is vaporized by a laser pulse in the presence of an inert carrier gas, usually helium, and the products of clustering in in the cooling plasma are studied by LIF, TOF mass spectroscopy or some other suitable spectroscopic technique. In the present work, we combine the pulsed laser vaporization with matrix isolation by replacing the He Carrier gas with condensible gas, usually neon, and condensing the products on a 4K substrate. The advantage of this technique is that the products of many pulses can be accumulated and subjected to a subsequent leisurely spectroscopic study. Preliminary experiments show that enrichments in relative cluster concentrations of more than an order of magnitude, when compared with conventionally deposited samples, are easily accomplished By adding suitable reactants to the neon carrier gas, metal oxides, nitrides or carbides can also be generated and studied. Experiments of this nature combined with electronic or infrared absorption or emission spectroscopy offer perhaps the best hope for structural characterization of a large variety of cluster species.
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