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  Ultrafast rotational motions of supported nanoclusters probed by electron diffraction

Vasileiadis, T., Skountzos, E. N., Foster, D., Coleman, S. P., Zahn, D., Krecinic, F., et al. (2019). Ultrafast rotational motions of supported nanoclusters probed by electron diffraction. Nanoscale Horizons, 4(5), 1164-1173. doi:10.1039/C9NH00031C.

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 Creators:
Vasileiadis, Thomas1, Author              
Skountzos, Emmauel N.2, 3, Author
Foster, Dawn4, Author
Coleman, Shawn P.5, Author
Zahn, Daniela1, Author              
Krecinic, Faruk1, Author              
Mavrantzas, Vlasis G.2, 3, 6, Author
Palmer, Richard E.7, Author
Ernstorfer, Ralph1, Author              
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Department of Chemical Engineering, University of Patras, Greece, ou_persistent22              
3FORTH/ICE-HT, Patras GR-26504, Greece , ou_persistent22              
4Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom, ou_persistent22              
5Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK , ou_persistent22              
6Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland, ou_persistent22              
7College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea SA1 8EN, United Kingdom, ou_persistent22              

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 Abstract: In crystals, microscopic energy flow is governed by electronic and vibrational excitations. In nanoscale materials, however, translations and rotations of entire nanoparticles represent additional fundamental excitations. The observation of such motions is elusive as most ultrafast techniques are insensitive to motions of the phonons’ frame of reference. Here, we study heterostructures of size-selected Au nanoclusters with partial (111) orientation on few-layer graphite with femtosecond electron diffraction. We demonstrate that ultrafast, constrained rotations of nanoclusters, so-called librations, in photo-induced non-equilibrium conditions can be observed separately from vibrational structural dynamics. Molecular dynamics and electron diffraction simulations provide quantitative understanding on librations-induced deviations from the conventional temperature dependence of diffraction patterns. We find that nanocluster librations with a period of ∼20 picoseconds are triggered quasi-impulsively by graphene flexural motions. These ultrafast structural dynamics modulate the Au/C interface and hence are expected to play a key role in energy- and mass-transport at the nanoscale.

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Language(s): eng - English
 Dates: 2019-01-152019-05-082019-05-092019-09-01
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/C9NH00031C
 Degree: -

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Project name : FLATLAND - Electron-lattice-spin correlations and many-body phenomena in 2D semiconductors and related heterostructures
Grant ID : 682843
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Nanoscale Horizons
  Abbreviation : Nanoscale Horiz.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: 10 Volume / Issue: 4 (5) Sequence Number: - Start / End Page: 1164 - 1173 Identifier: ISSN: 2055-6756
CoNE: https://pure.mpg.de/cone/journals/resource/2055-6756