Abstract
Measurements of the fluctuation bands in the ultra-violet absorption spectra of NaF, KF, RbF, RbCl, RbBr, Rbl, CsF, CsCl, CsBr and Csl are reported, and upper limits for the dissociation energies of the twelve K, Rb and Cs halides are deduced. Thermochemical information about these molecules is considered, and a value for the dissociation energy of fluorine,
D
F
2
= 37.6 ± 3.5 kcal or 157.3 ± 14.6 kJ (298° K), is derived.
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