Abstract
UNTIL recently, the dissociation energy of molecular fluorine was believed to be about 63 kcal./mole1. Within the past few years, however, evidence—based in particular upon spectroscopic2,3 and thermochemical2,4 studies of ClF—has accumulated to suggest that D(F2) is much lower. Thus, a mean value for the heat of formation of ClF at 18° C. is 12·3 ± 1 kcal.: combining this with the value of D18(ClF), 61·2 ± 0·5 kcal. or 59·8 ± 0·5 kcal. (according to the state of excitation of the atoms on dissociation of excited ClF) leads to D18(F2) = 40·0 or 37·2 ± 3 kcal.
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CAUNT, A., BARROW, R. Ultra-Violet Absorption Spectra of Rubidium and Cæsium Fluorides and the Heat of Dissociation of Fluorine. Nature 164, 753–754 (1949). https://doi.org/10.1038/164753a0
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DOI: https://doi.org/10.1038/164753a0
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