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The measurement of the absorption cross-section of ozone is difficult to realize, because of challenges in producing a known ozone concentration which can be accurately determined with an independent method that does not involve a photometric measurement. The method chosen by the BIPM consists of producing pure ozone by discharges in pure oxygen, and further monitoring the pressure of the mixture, which will regularly increase as ozone decomposes back to oxygen, according to the reaction 2 O3 → 3 O2. In addition, the purity of the sample will be assessed by mass spectrometry. The accuracy of the photometric measurement will also be determined by interferometric measurements of the light path length in the absorption cell.
The ozone cross-section measurement set-up, including the cryogenic ozone generator, short
path length absorption cell, pressure measurement device and mass spectrometer.
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Summary
