EELS in Transmission

Scattering Geometry

Possible EELS Excitations

• additional possibility to perform elastic scattering by setting the energy-loss ΔE to zero (Bragg scattering)

Setup of the EELS Spectrometer

(not to scale)

1 - Source, 2 - Monochromator, 3 - Zoom lenses, 4 - Accelerator, 5 - Sample holder with cryostate, 6 - Deflection plates,  7 - Decelerator, 8 - Zoom lenses, 9 - Analyser, 10 - Multiplier, 11 - Preperation chamber, 12 - Sample magazine and Fast entry

• preparation, storage and measurements under UHV-conditions (p = 10⁻¹¹ ... 10⁻⁸ mbar)
• accelarator voltage of 172 keV
• high energy and momentum resolution ( ΔE ≈ 80 meV and Δq ≈ 0.03 Å^-1 )
• possibility to cool down to 20 K with a He flow cryostat

Research Fields

• Molecular solids / organic semiconductors

• Cuprate superconductors
• Charge-density wave systems
• Transition metal oxides

IFF / Electronic and optical Properties || Last update 13. April 2011 || Authors: F. Roth, A. König