Dissociative photoionization cross sections of O2 from threshold to 120 Å

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Abstract
The photoionization cross sections for producing the O2+ parent ion and the O+ fragment ion from neutral O2 are presented from 650 to 120 Å. A new technique was used that eliminated the serious problem of identifying the true abundance of the O+ ions. These ions are generally formed with considerable kinetic energy and because most mass spectrometers discriminate against energetic ions true O+ abundances are difficult to obtain. In the present work the relative cross sections for producing O2+ are obtained and normalized against the total cross sections in a spectral region where dissociative ionization is not possible. The fragmentation cross sections for O+ were then obtained by subtraction of the O2+ cross section from the total photoionization cross section.

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