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The use of ro-vibronic spectra of I2 in the region of 543 nm to 578 nm asreference spectra for atmospheric Differential Optical AbsorptionSpectroscopy is studied. It is shown that the retrieval of atmosphericcolumn densities with Differential Optical Absorption Spectroscopy set-upsat FWHM at and above 1 nm depends critically on the column density, underwhich the used reference spectrum was recorded. Systematic overestimation ofthe comparatively low atmospheric column density of I2 of the order of13% is possible. Under low pressure conditions relevant in laboratorystudies, the systematic deviations may grow up to 45%. To avoid sucheffects with respect to field measurements, new reference spectra of I2were determined under column density of the order of 1016 cm-2close to that expected for an atmospheric measurement. Two typicalconfigurations of Differential Optical Absorption Spectroscopy, which usegrating spectrometers, were chosen for the spectroscopic set-up. Onespectrum was recorded at similar resolution (0.25 nm FWHM) but finer binning(0.035 nm/pixel) than previously published data. For the other (0.59 nm FWHM,0.154 nm/pixel) no previously published spectra exist. Wavelength calibrationis accurate to ±0.04,nm and ±0.11 nm respectively. The absorptioncross section for the recordings was determined under low column densitywith an accuracy of ±4% and ±3% respectively. The absoluteabsorption cross section of I2 at 500 nm (wavelength: in standard air)in the continuum absorption region was determined using a method independentof iodine vapour pressure. Obtained was σI2 (500 nm)=(2.186±0.021·10-18 cm2 in very good agreement with previouslypublished results, but at 50% smaller uncertainty. From this andpreviously published results a weighted average of σI2(500 nm)=(2.191±0.02)·10-18 cm2 is determined

atmospheric chemistry and physics

Effects of column density on I&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; spectroscopy and a determination of I&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; absorption cross section at 500 nm