Magnesium Fluoride Window

The non-monochromatized terminals 1 and 2 contain an insertable Magnesium Fluoride window. The window is a high energy cut-off for photon energies above 11.2eV. Terminals 3 and 4 may also benefit from the window accessing photons below 8.0 eV. The MgF2 window allows for operation using Ar in a gas filter instead of expensive Krypton or Xenon.