Features: Ultimate resolution 0.5 meV (FWHM) Guaranteed detector current > 10 pA at 1meV resolution (FWHM) Scan range -0.25 - 1eV / 0 - 50eV Analyzer rotation angle >90° Fixed double stage monochromator Rotatable single stage analyzer Two-dimensional focussing electrostatic energy dispersive elements

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The DELTA 0.5 can be supplied as a "bolt on component" or as part of a complete UHV-system for surface analysis.

Applications:
Investigation at surfaces for

• Phonons
• Adsorbate vibrations
• Electronic transitions

Product Description:
The DELTA 0.5 is an Ultimate Resolution Electron Energy Loss Spectrometer "HR EELS", designed and developed by Professor Harald Ibach, Institut für Grenzflächenforschung und Vakuumphysik, KFA Jülich, Germany. With its new generation of two dimensional focussing electrostatic energy dispersive element, it gives a resolution of 0.5meV (as opposed to 5-7meV, which was previously the maximum resolution in EELS). In recent years Electron Energy Loss Spectroscopy (EELS) has become a popular technique in surface analysis for the investigation of phonons, adsorbate vibrations, and electronic transitions.
Under the brand name "DELTA 0.5" SPECS GmbH produces the Ultimate Resolution Electron Energy Loss Spectrometer in Germany as licensee of the KFA Julich. SPECS distributes the DELTA 0.5 worldwide.

Schematic sketch of the DELTA 0.5

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