Sketch of a cathodoluminescence system: The electron beam passes through a
small aperture in the parabolic mirror which collects the light and reflects it into
the spectrometer. A charge-coupled device (CCD) or photomultiplier (PMT) can
be used for parallel or monochromatic detection, respectively. An electron beam-induced current (EBIC) signal

may be recorded simultaneously.
Own work
Pv42