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.
Read more about this topic: Inverse Photoemission Spectroscopy
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