Recent applications of sub 20meV monochromated STEM-EELS: from phonons to core losses in real and momentum space

Add to your list(s) Download to your calendar using vCal

• Quentin Ramasse, The EPSRC National Facility for Aberration Corrected STEM (SuperSTEM), United Kingdom
• Tuesday 14 June 2016, 11:30-12:30
• LT Goldsmith 1 Materials Science and Metallurgy, Department of.

If you have a question about this talk, please contact Duncan Johnstone.

A new generation of electron beam monochromators has recently pushed the energy resolution of (scanning) transmission electron microscopes deep into the sub 20meV range. In addition to the obvious increase in resolution which has made exploring the phonon region of the EELS spectrum possible, the increased flexibility of these instruments is proving hugely advantageous for materials science investigations. Recent applications include 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-conductor materials as a function of local structure and chemistry. The energy resolution, beam current and electron optics can be adjusted seamlessly 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 UltraSTEM100MC ‘Hermes’ instrument recently installed at the SuperSTEM Laboratory.

This talk is part of the Electron Microscopy Group Seminars series.

This talk is included in these lists:

• All Talks (aka the CURE list)
• Art Cell Gallery Exhibtions
• Cambridge Advanced Imaging Seminars
• Electron Microscopy Group Seminars
• Featured lists
• LT Goldsmith 1 Materials Science and Metallurgy, Department of
• Museums in Cambridge
• cambridge advanced imaging

Note that ex-directory lists are not shown.