[Show abstract][Hide abstract] ABSTRACT: Using the scanning imaging absorption spectrometer for atmospheric chartography (SCIAMACHY) pre-flight model satellite spectrometer, gas-phase absorption spectra of the most important atmospheric trace gases (O3, NO2, SO2, O2, OClO, H2CO, H2O, CO, CO2, CH4, and N2O) have been measured in the 230–2380nm range at medium spectral resolution and at several temperatures between 203 and 293K. The spectra show high signal-to-noise ratio (between 200 up to a few thousands), high baseline stability (better than 10−2) and an accurate wavelength calibration (better than 0.01nm) and were scaled to absolute absorption cross-sections using previously published data. The results are important as reference data for atmospheric remote-sensing and physical chemistry. Amongst other results, the first measurements of the Wulf bands of O3 up to their origin above 1000nm were made at five different temperatures between 203 and 293K, the first UV-Vis absorption cross-sections of NO2 in gas-phase equilibrium at 203K were recorded, and the ultraviolet absorption cross-sections of SO2 were measured at five different temperatures between 203 and 296K. In addition, the molecular absorption spectra were used to improve the wavelength calibration of the SCIAMACHY spectrometer and to characterize the instrumental line shape (ILS) and straylight properties of the instrument. It is demonstrated that laboratory measurements of molecular trace gas absorption spectra prior to launch are important for satellite instrument characterization and to validate and improve the spectroscopic database.
Journal of Photochemistry and Photobiology A Chemistry 05/2003; 157(2):167-184. · 2.29 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: this paper are given for vacuum conditions. Prior to the measurements presented in this paper the SCIAMACHY spectrometer was characterized and calibrated by industry (consortium of Fokker Space, Dornier, TPD--TNO, SRON and others) providing data concerning the pixel--to--pixel gain, stray light properties, the slit function in each channel, the wavelength calibration and the polarization properties . A detailed description of the SCIAMACHY instrument is given in , 
[Show abstract][Hide abstract] ABSTRACT: In this Letter, we have recorded and analyzed new absorption spectra of ozone (215–2400 nm) at temperatures between 203 and 293 K. Two vibrational progressions have been identified in the visible part of the spectrum between 375 and 505 nm, leading to vibrational assignments, upper state's vibrational frequencies and anharmonic coupling constants, and to an estimation of the vertical electronic energy of the 1B1 state, in overall agreement with recent theoretical predictions and with measurements of isotopic shifts at lower energies that were available in the literature.
Chemical Physics Letters 11/2001; · 1.99 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Absolute absorption cross sections of O3 were measured in the 230–850 nm (11765–43478 cm−1) region at five different temperatures (203–293 K) using a Fourier-transform spectrometer, at a spectral resolution of 5.0 cm−1 (corresponding to about 0.027 nm at 230 nm and to about 0.36 nm at 850 nm). The spectral accuracy of the data is better than 0.1 cm−1 — about 0.5 pm at 230 nm and about 7.2 pm at 850 nm — validated by recording of I2 absorption spectra in the visible using the same experimental set-up. O3 absorption spectra at different concentrations were recorded at five different sample temperatures in the range 203–293 K, and at each temperature at two total pressures (100 and 1000 mbar) using O2/N2 mixtures as buffer gas. Within the limits of experimental uncertainties, no influence of total pressure on the O3 spectrum was observed in the entire spectral region, as expected from the short lifetimes of the upper electronic states of O3. The temperature dependence of the O3 absorption cross sections is particularly strong in the Huggins bands between 310 and 380 nm, as observed in previous studies. An empirical formula is used to model the temperature dependence of the O3 absorption cross sections between 236 and 362 nm, a spectral region that is particularly important for atmospheric remote-sensing and for photochemical modelling.
Journal of Photochemistry and Photobiology A Chemistry 10/2001; · 2.29 Impact Factor