Abstract
IN two letters, published in NATURE of June 29, P. Goldfinger, W. Lasareff and B. Rosen have calculated the heat of dissociation of carbon monoxide and afterwards the heat of sublimation of carbon. They obtain their figures from the predissociations of the term B1, and the number of observed vibrational levels of the term A1 of CO. There is, however, still another possibility of determining D(CO) originally suggested by Kaplan1. Of each of the two electronic states b3 and b, only one vibrational level is known, and this leads to the assumption of a repulsive curve, intersecting the potential curves of these two levels at 10·6 v.e. This value is well between the lower and upper limits (10·4 and 11·07 v.e. respectively) calculated by Goldfinger and Lasareff, but slightly below their final estimated value of 11·0 ± 0·1 v.e.
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References
J. Kaplan, Phys. Rev., 37, 1406; 1931.
H. Lessheim and R. Samuel, Proc. Phys. Soc. Lond., 46, 523; 1934.
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LESSHEIM, H., SAMUEL, R. Dissociation Energy of Carbon Monoxide and the Heat of Sublimation of Carbon. Nature 136, 606 (1935). https://doi.org/10.1038/136606a0
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DOI: https://doi.org/10.1038/136606a0
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