Absorption Spectrum of Fluorine in the Vacuum Ultraviolet

Abstract
The absorption spectrum of F2 has been observed in the vacuum ultraviolet region. A special windowless absorption apparatus and a Lyman discharge light source were used in combination with a one-meter normal incidence spectrograph. A Rydberg series establishes the ionization potential of F2 as 15.7 ev. From a progression of bands at 874 A, one can deduce the dissociation energy of fluorine as 37.5±2 kcal/mole. The binding energy of F2+ is 3.3 ev. The low value of the ionization potential is consistent with the observed low value of the dissociation energy.

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