| Photoabsorption of ag_{n}(n∼6-6000) nanoclusters formed in helium droplets: transition from compact to multicenter aggregation. | |
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MedLine Citation:
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PMID: 21770503 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Ag_{N} clusters with up to thousands of atoms were grown in large He droplets and studied by optical spectroscopy. For N≲10^{3} the spectra are dominated by a surface plasmon resonance near 3.8 eV and a broad feature in the UV, consistent with absorption by individual metallic particles. Larger clusters reveal unexpectedly strong broad absorption at low frequencies, extending down to ≈0.5 eV. This suggests a transition from single-center to multicenter formation, in agreement with estimates of cluster growth kinetics in He droplets. Moreover, the spectra of large clusters develop a characteristic dispersion profile at 3.5-4.5 eV, indicative of the coexistence of localized and delocalized electronic excitations in composite clusters, as predicted theoretically. |
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Authors:
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Evgeny Loginov; Luis F Gomez; Naihao Chiang; Avik Halder; Nicholas Guggemos; Vitaly V Kresin; Andrey F Vilesov |
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Publication Detail:
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Type: Journal Article Date: 2011-06-10 |
Journal Detail:
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Title: Physical review letters Volume: 106 ISSN: 1079-7114 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-07-20 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 233401 Citation Subset: IM |
Affiliation:
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Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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