Absorption Coefficients of O2 in the Vacuum Ultraviolet

With a resolution of 0.2 A the absorption coefficients of O2 were obtained for about 600 wavelengths in the region 840-1100 A and also at 584.3 A. This method resolved band structures which were not detected by previous photoelectric measurements and at many wavelengths where comparison could be made the absorption coefficients agreed closely with the earlier data. Also with this improved resolution a pressure effect was observed for the pre-ionized H, H', M and M' bands. Continua due to photodissociation and photoionization were observed in the absorption spectrum. Vibrational levels of the ion were inferred from the absorption spectrum. Several absorption bands seem to form a limit at 1026.5 A, the position of the ionization potential obtained by a photo-ionization method.