The symbiosis of the Fourier transform spectrometer with the computer permits the development of novel procedures for handling spectroscopic data. Two such procedures are here described. The first one produces directly the spectrum of the intermolecular interaction perturbation in solutions, while the second obtains the spectrum of pressure broadening coefficients of a gas sample. The interpretation of these techniques are discussed in the light of experimental results and shown to be critically dependent on a constant, well defined slit function and on nearly perfect spectral and intensity registration.

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