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The surface analysis made using X-ray photoelectron spectroscopy revealed traces of copper corrosion tightly bonded with the residue.—Pranjal Malewar, New Atlas, 10 Aug. 2025 For example, a photoelectron spectrometer detects how many electrons were removed from the atom by the probe pulse, or a photon spectrometer measures how much of the probe pulse was absorbed by the atom.—Niranjan Shivaram, The Conversation, 4 Oct. 2023 The rest of the photon’s energy is transferred to the now free-roaming negative charge, called a photoelectron.—Everyday Einstein Sabrina Stierwalt, Scientific American, 18 Aug. 2015
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