UV-Vis absorption spectra of gaseous molecules: a data base including numerical data and graphical representations

We have established a data base of UV-VIS absorption spectra of gaseous molecules and radicals, which currently contains more than 3000 spectra measured over the last 8 decades. They are given as numerical data files, i.e., absorption cross section vs. wavelength, where the spectral range mainly consists of the near-UV region relevant for atmospheric research. Nevertheless, available data for the far-UV have occasionally been included. Besides the collection of the numerical data sets for each individual measurement per species, graphical representations are given, which allow comparison of the absorption features obtained by the various research teams. The individual data sets were collected from the original publications, either copied from tabulations, or read from figures in those cases where numerical data could no longer be obtained. Other sources rely on the internal data bases of several research centers dealing with atmospheric chemistry and/or molecular spectroscopy. Numerous excellent high-resolution spectra were obtained from personal communications with the scientists. For some classes of atmospherically relevant species, such as the halogenated alkanes and a few peroxy radicals, the absorption cross sections have been evaluated as part of the JPL-NASA Data Evaluation. These data sets can also be found in our data base. A data base for quantum yields of atmospherically relevant species is in progress. It is our intention to make the UV-VIS data base available in the Internet in the near future. We accept all pertinent input from the scientific community to expand our collection.