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