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65:. As a result if the device is operated in single-photon count mode the energy of each captured photon can be calculated in the visible-light range, where photons have energies of a few electronvolts, each generating >20,000 electrons. In a normal CCD, only one primary electron is generated per photon, except for very energetic photons, like
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In 2006 the SCAM instrument was mounted on the ESA's
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European Space Agency: ESA's new camera will revolutionise the way astronomers observe the
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detectors, to register almost every photon of light that falls onto it.
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