Analysis of Gas-Phase Clusters Made from Laser-Vaporized Icosahedral Al−Pd−Mn

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2002-10-10
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Barrow, J.
Sordelet, D.
Besser, Matthew
Jenks, Cynthia
Rexer, E.
Riley, S.
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Chemistry

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An icosahedral Al−Pd−Mn quasicrystal sample is laser vaporized to form metal clusters by gas aggregation. The clusters are subsequently laser ionized and mass analyzed in a time-of-flight mass spectrometer. The mass spectra show cluster compositions which are qualitatively similar to that of the sample. This is consistent with a kinetically controlled cluster growth process. Cluster thermodynamic stability is probed by multiphoton ionization/fragmentation, which induces primarily Al and Mn loss. The resulting spectra are composed of a series of Pd-rich Al−Pd clusters. The average cluster composition is 60 (±1)% Pd. This composition is close to a known eutectic in the Al−Pd system. When manganese is seen on these clusters, it is always in units of Mn3. These results are discussed in terms of relative binding strengths in the Al−Pd−Mn alloy system.

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Posted with permission from The Journal of Physical Chemistry A 106, no. 40 (2002): 9204–9208, doi:10.1021/jp025662k. Copyright 2002 American Chemical Society.

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Tue Jan 01 00:00:00 UTC 2002
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