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SUMMARY:Imaging molecules and atoms in motions and reactions by HR-(S)TEM 
 - Dr Masanori Koshino\, National Institute of Advanced Industrial Science 
 and Technology (AIST) in Tsukuba\, Japan
DTSTART:20110713T140000Z
DTEND:20110713T150000Z
UID:TALK32076@talks.cam.ac.uk
CONTACT:Dr Jonathan Barnard
DESCRIPTION:Some reactions of a molecule start from an encounter with othe
 r\nmolecules accelerated by phonons\, photons\, or electrons. The rate of 
 reactions is often discussed from kinetics of the system and dynamics of m
 olecules where the experimental conditions such as pressure\, concentratio
 n\, temperature\, and existence of catalysts affect the system. Classic ap
 proaches to characterize such behaviours are based on the analysis of ther
 modynamics\, spectroscopy\, or microscopy that deal with enormous amounts 
 or assembly of molecules in order to gain enough signal/noise ratios. Scie
 ntists have dreamed of capturing the very moment of reactions when the mol
 ecules change their structures.\n\nAlthough the recent development of aber
 ration corrector has\nsubstantially improved the spatial resolution limit 
 of scanning and\ntransmission electron microscopy (S/TEM)\, the attainable
  resolution is practically determined by the tolerant dose especially for 
 damage\nsensitive materials. This is indeed the major problem why the indi
 vidual molecular imaging by S/TEM is intrinsically difficult to be realize
 d with the real atomic scale.\n\nRecently it has been demonstrated that th
 e motional behaviors of single molecules can be characterized by TEM [1-3]
 . The motional analysis at atomic-level has a great potential to witness v
 arious chemical reactions. The bimolecular reactions of fullerene and meta
 llo fullerene molecules in carbon nanotube were studied by TEM\, proving t
 hat the atomic resolution imaging of chemical reaction is indeed possible 
 with moderate experimental conditions [4]. The motion pictures of the dime
 risation process revealed the specific orientations in which two molecules
  interacted\, as well as how bond reorganization occurred after the initia
 l contact of the two molecules. Studies on the concentration\, the specime
 n temperature\, the effect of catalyst and the accelerating voltage indica
 ted that imaging the reactions can be achieved under a considerable variet
 y of conditions. The topic may cover a recent STEM-EELS analysis of graphe
 ne edge [5].\n\n# Liu\, Z. et al. Phys. Rev. Lett. 96\, 088304 (2006).\n# 
 Koshino M. et al. Science 316\, 853 (2007).\n# Koshino\, M.\, et al. Nat. 
 Nano. 3\, 595 (2008).\n# Koshino\, M.\, et al. Nat. Chem. 2\, 117\, (2010)
 .\n# Suenaga\, K.\, & Koshino\, M.\, Nature\, 468 1088–1090 (2010).
LOCATION:T001 [Tower Seminar Room]\, Materials Science and Metallurgy\, De
 partment of
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