Abstract
The photoabsorption coefficient of molecular oxygen has been measured at 1215.70 A and in the ranges 1205 A–1214 A and 1218 A–1225 A with an average resolution of ±0.015 A. The light source in this experiment was the Doppler shifted radiation obtained from Stark quenching of a metastable hydrogen beam with energies between 2 keV and 60 keV. Using observation angles of 45°, 90°, and 135° with respect to the beam the above mentioned tuning ranges are obtained. Our data join smoothly to those of Ogawa [1] in the range 1214 A–1218 A and are in fair agreement with earlier measurements in other laboratories. Analytical expressions for the absorption coefficient for use in geophysical applications are presented for the whole wavelength range 1205 A–1225 A. Rotational structure of the absorption coefficient in the range 1220 A–1223 A arising from the 3-0 band of theα1∑u+-X3∑g− forbidden transition in molecular oxygen is clearly resolved in the present measurements. A transition probability ofA=4×104 s−1 is obtained for this system. A careful study of a possible pressure dependence of the absorption coefficient was made. Except from the region were rotational line absorption occurs and the single point at 1215.70 A no measurable effect was found for pressures below 100 Torr.
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