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Structural preablation dynamics of graphite observed by ultrafast electron crystallography.
MedLine Citation:
PMID:  18232996     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
By means of time-resolved electron crystallography, we report direct observation of the structural dynamics of graphite, providing new insights into the processes involving coherent lattice motions and ultrafast graphene ablation. When graphite is excited by an ultrashort laser pulse, the excited carriers reach their equilibrium in less then one picosecond by transferring heat to a subset of strongly coupled optical phonons. The time-resolved diffraction data show that on such a time scale the crystal undergoes a contraction whose velocity depends on the excitation fluence. The contraction is followed by a large expansion which, at sufficiently high fluence, leads to the ablation of entire graphene layers, as recently predicted theoretically.
Authors:
Fabrizio Carbone; Peter Baum; Petra Rudolf; Ahmed H Zewail
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Publication Detail:
Type:  Journal Article     Date:  2008-01-22
Journal Detail:
Title:  Physical review letters     Volume:  100     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2008-01-31     Completed Date:  2008-05-01     Revised Date:  2011-06-14    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  035501     Citation Subset:  -    
Affiliation:
Physical Biology Center for Ultrafast Science & Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA.
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Comment In:
Phys Rev Lett. 2010 Jul 30;105(5):059603; author reply 059604   [PMID:  20867959 ]
Erratum In:
Phys Rev Lett. 2011 Apr 1;106(13):139901

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