Array Detector for Charge-Detection Mass Spectrometer

The pixelated array detector (PAD) is a planar array of complementary metal oxide/semiconductor (CMOS) charge-collecting electrodes and readout circuitry for measuring the electric charges on particles in a charge-detection mass spectrometer (CDMS). In comparison with a single-Faraday-cup detector occupying the same total area, the PAD offers advantages, as explained below.