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Photon counting with dual thresholds

LAMBDA photon counting detectors allow noiseless imaging using dual thresholds. How is this advantageous compared to imaging with a single threshold? Common monochromators typically have problems reducing the harmonic content of the main beam to lower than about 1 percent, and unless your beamline uses special optics to reduce the harmonic content further these high energy photons will create additional background in your experiments. Conventional photon counters have their discrimination threshold set to 1/2 of the beam energy, and count every photon above this threshold as if it was a diffracted photon. With the LAMBDA camera you can set the additional threshold such that you only count photons of an energy defined by the window between the two thresholds. In this way higher energy photons are ignored and do not contribute to the background!
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