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Abstract
Combining Intra Cavity Laser Absorption and Time Resolved Fourier transform spectro-scopies (ICLAS-TRFTS) brings original advantages that are derived from the ability to obtain consistent series of Fourier spectra recorded according to a well-defined time sequence on the same accurate wavenumber scale. These advantages, mainly centred on the possibility to perform quantitative measurements are discussed and evaluated. Accurate determination of line positions and intensities of ultra weak transitions previously hardly measurable becomes possible. Ultimate limits are estimated for the present experiment in the neqr infrared range for H2O.