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SUMMARY:Recent applications of sub 20meV monochromated STEM-EELS: from pho
 nons to core losses in real and momentum space - Quentin Ramasse\, The EPS
 RC National Facility for Aberration Corrected STEM (SuperSTEM)\, United Ki
 ngdom
DTSTART:20160614T103000Z
DTEND:20160614T113000Z
UID:TALK66441@talks.cam.ac.uk
CONTACT:Duncan Johnstone
DESCRIPTION:A new generation of electron beam monochromators has recently 
 pushed the energy resolution of (scanning) transmission electron microscop
 es deep into the sub 20meV range. In addition to the obvious increase in r
 esolution which has made exploring the phonon region of the EELS spectrum 
 possible\, the increased flexibility of these instruments is proving hugel
 y advantageous for materials science investigations. Recent applications i
 nclude the observations of complex electronic transitions such as excitons
  in MoS2\, van Hove singularities in carbon nanotubes in real and momentum
  space\, as well as mapping minute changes in band gap energies of semi-co
 nductor materials as a function of local structure and chemistry. The ener
 gy resolution\, beam current and electron optics can be adjusted seamlessl
 y and traded off each other as necessary within a greatly increased range\
 , as will be illustrated on a number of systems studied using a Nion Ultra
 STEM100MC 'Hermes' instrument recently installed at the SuperSTEM Laborato
 ry.
LOCATION:LT Goldsmith 1 Materials Science and Metallurgy\, Department of
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