Spectroscopy Group

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ARPES basics

UV sources
     He lamp
Electron Analyzers
     electron lenses
     time-of flight
     resistive anode

ARPES - Angle Resolved Photoemission Spectroscopy is a fantastic method for studying electronic properties (band structure and electronic interactions) in solids. The idea of this technique is very simple: shine a high energy photon on the sample. This causes emission of the photoelectrons. By measuring the angular and energy distribution of the emitted photoelectrons we can obtain the principle quantum numbers of the electrons, when they were still in the sample. In practice this is a bit more technically involved as number of complicated instruments need to be utilized.