Extreme ultraviolet photodissociative excitation of molecular oxygen

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Abstract
Photodissociation processes in molecular oxygen occurring in the wavelength range 500–900 Å (14–25 eV) have been investigated through observation of the resulting atomic fluorescence radiation. The dispersed radiation from a continuous light source was used to excite the gas, and the resulting fluorescence radiation was observed in the ultraviolet and infrared. For incident wavelengths between 750 and 850 Å (14.6–16.5 eV) the OI(2p3 3s 3S0) state, from which the 1302–1306 Å resonance lines are produced, is populated by predissociation. At higher energies, between 650 and 770 Å(16.1–19.1 eV), a photodissociation process occurs which produces the OI 1302–6 Å lines. Photodissociation to produce OI(2p3 3p 5P) was found to occur in the wavelength interval 740–780 Å (15.9–16.75 eV) by observation of the resulting OIλ7773 Å radiation. Comparison of the results with the dissociation cross sections of Matsunaga and Watanabe suggests that photodissociation in the 800 Å region results in the formation of OI(2p3 3s 5S0).