O3 and other atmospheric trace gases are currently monitored by spectroscopic techniques in the UV-visible spectral range.

Very accurate laboratory reference spectra are needed for the data analysis.

Fourier-Transform spectroscopy has the great advantages of covering a broad spectral range with very high wavelength accuracy and of a well-known instrumental line shape (the "sinc" function).

Everybody who needs accurate O3 reference spectra can use the new spectra by convolution with the appropriate instrumental line shape (e.g. grating spectrometers).

instrument: Bruker IFS-120 HR Fourier-Transform spectrometer

broadband white light sources: 75 W Xenon arc (Hamatsu Super-Quiet), 50 W QTH (Osram Xenophot)

beamsplitter: UV-grade quartz (for all spectral regions)

detectors: Si diode, GaP diode, UV (solar-blind) photodiode

absorption cell: White coolable type multipass cell, pathlengths of 120 cm, 505 cm, and 985 cm

O3 absorption cross sections in the spectral range between 240-850 nm O3 sample temperatures: 203 K, 223 K, 246 K, 280 K, 293 K

total sample pressures: 100 mbar and 1000 mbar (N2 as buffer gas)

spectral resolution: 5.0 cm-1 (0.028 nm at 240 nm and 0.36 nm at 850 nm)

spectral accuracy: ca. 0.01 cm-1 (0.00006 nm at 240 nm and 0.0007 nm at 850 nm)

uncertainty of absorption cross sections: wavelength dependent, in many regions better than 5%