Inverse Photoemission Spectroscopy - Isochromat Mode

Isochromat Mode

In the isochromat mode, the incident electron energy is ramped and the emitted photons are detected at a fixed energy that is determined by the photon detector. Typically, an I₂ gas filled Geiger-Müller tube with an entrance window of either SrF₂ or CaF₂ is used as the photon detector. The combination of window and filling gas determines the detected photon energy, and for I₂ gas and either a SrF₂ or CaF₂ window, the photons energies are ~ 9.5 eV and ~ 9.7 eV, respectively.