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Photoionization mass spectrometry of S2O yields an ionization potential of 10.58±0.01 eV, and a 0°K threshold for SO+ production of 13.745±0.006 eV. The heat of formation of S2O is deduced to be −12.75±0.25 kcal/mole.
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Berkowitz et al. (1977) studied this question.
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