The total absorption of radiation in the 2000-2800 A region has been measured for 0 2 . The absorption does not follow Beer's law. The linear increase in the measured effective absorption cross section with rise in gas pressure is ascribed to the absorption caused by 0 4 . With methods developed and presented recently by the writer, the absorption cross sections of 0 2 and 0 4 are derived from total absorption measurements.
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