Absolute absorption cross sections have been measured for the rare gases at 58.43, 73.59, and 74.37 nm with an accuracy of ±0.8%. For the molecules H₂, N₂, O₂, CO₂, N₂O, CO₂, and CH₄, precision measurements were made at 58.43 nm with an accuracy of ±0.8%. Molecular absorption cross sections are also reported at 73.59 and 74.37 nm. However, in the vicinity of these wavelengths most molecules exhibit considerable structure, and cross sections measured at these wavelengths may depend on the widths and the amounts of self-reversal of these resonance lines. A detailed discussion is given of the systematic errors encountered with the double-ion chamber used in the crosssectional measurements. Details are also given of precision pressure measurements.

© 1989 Optical Society of America

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