Abstract
The absorption band spectrum of fluorine has been observed in the extreme vacuum ultraviolet using the Hopfield continuum as light source. The spectrum was photographied by means of a 3 m Hilger normal incidence spectrograph fitted with a differential pumping system. From a rapidly converging v′-progression of bands at 877-857 Å the dissociation energy of the F2-molecule in the groundstate has been established as (1.44 ± 0.07) eV. In connection with the emission band spectrum of F2 in the visible it has been possible to determine the states of the participating transitions in the ultraviolet as well as in the visible region.
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