Georg Wagner

High resolution wavenumber standards for the infrared (Technical Report)

The calibration of high resolution infrared spectra is generally more precise than accurate. This is the case even when they are recorded with Fourier transform interferometers. The present document aims at improving the accuracy of wavenumber measurements in the infrared by recommending a selection of spectral lines as wavenumber standards for absolute calibration in the range from about 4 to about 7000 cm(-1). The uncertainties of these wavenumber standards range from 4+/-1x10(-3) to +/-1x10(-6) cm(-1). Sources of frequency standards, on which the wavenumber determinations are based, are also given.

Nonintrusive optical measurements of aircraft engine exhaust emissions and comparison with standard intrusive techniques

Nonintrusive systems for the measurement on test rigs of aeroengine exhaust emissions required for engine certification (CO, NO(x), total unburned hydrocarbon, and smoke), together with CO(2) and temperature have been developed. These results have been compared with current certified intrusive measurements on an engine test. A spectroscopic database and data-analysis software has been developed to enable Fourier-transform Infrared measurement of concentrations of molecular species. CO(2), CO, and NO data showed agreement with intrusive techniques of approximately ?30%. A narrow-band spectroscopic device was used to measure CO(2) (with deviations of less than ?10% from the intrusive measurement), whereas laser-induced incandescence was used to measure particles. Future improvements to allow for the commercial use of the nonintrusive systems have been identified and the methods are applicable to any measurement of combustion emissions.

Determination of line strengths by Fourier-transform spectroscopy.

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Development and characterization of the superconducting integrated receiver channel of the TELIS atmospheric sounder

C. Claveau, C. Camy-Peyret, A. Valentin and J.-M. Flaud, J. Mol. Spectrosc., in press

Spectroscopic parameters for ozone and its isotopes: recent measurements, outstanding issues, and prospects for improvements to HITRAN

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Experimental line strengths of the ClO fundamental

M.R. De Backer-Barilly and A. Barbe, J. Mol. Spectrosc., 205,43-53 (2001)

First high-resolution analyses of the ν8 and ν8 + ν9 spectral regions of 35CIONO2: determination of the ν9 band centre

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High resolution ro-vibrational analysis of the ν2 spectral region of chlorine nitrate

G. Wagner, M. Birk, F. Schreier and J.-M. Flaud, J. Geophys. Res., submitted

The global picture of the atmospheric composition provided by MIPAS on Envisat

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