Articles | Volume 11, issue 3
https://doi.org/10.5194/amt-11-1707-2018
https://doi.org/10.5194/amt-11-1707-2018
Research article
 | 
27 Mar 2018
Research article |  | 27 Mar 2018

A new photometric ozone reference in the Huggins bands: the absolute ozone absorption cross section at the 325 nm HeCd laser wavelength

Christof Janssen, Hadj Elandaloussi, and Julian Gröbner

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Short summary
Monitoring ozone layer recovery at a rate of few percent per decade requires dedicated instrumentation and spectroscopic data of the highest quality. Highly accurate absorption cross sections of ozone are rare, especially in the important UV region between 300 and 340 nm. Our measurement provides the first reference point with permil level of accuracy in this range. Interestingly, our value is lower than currently used data. This might resolve an inconsistency between UV and IR measurements.