Open AccessAnalysis of Gas-Phase Clusters Made from Laser-Vaporized Icosahedral Al−Pd−Mn
Author(s) -
J. Barrow,
D.J. Sordelet,
M.F. Besser,
C. J. Jenks,
P. A. Thiel,
Eric F. Rexer,
S. J. Riley
Publication year - 2002
Publication title -
the journal of physical chemistry a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.756
H-Index - 235
eISSN - 1520-5215
pISSN - 1089-5639
DOI - 10.1021/jp025662k
Subject(s) - chemistry , icosahedral symmetry , cluster (spacecraft) , mass spectrum , ionization , fragmentation (computing) , mass spectrometry , quasicrystal , stoichiometry , spectral line , manganese , analytical chemistry (journal) , metal , alloy , atomic physics , crystallography , ion , physics , organic chemistry , chromatography , astronomy , computer science , programming language , operating system
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 Mn 3 . These results are discussed in terms of relative binding strengths in the Al-Pd-Mn alloy system.
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