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Hartmann J.-M., Boulet Ch., Robert D. Collisional Effects on Molecular Spectra: Laboratory experiments and models, consequences for applications
Elsevier Science, 2008, pages: 432

Gas phase molecular spectroscopy is a powerful tool for obtaining information on the geometry and inteal structure of isolated molecules as well as on the interactions that they undergo. It enables the study of fundamental parameters and processes and is also used for the sounding of gas media through optical techniques. It has been facing always renewed challenges, due to the considerable improvement of experimental techniques and the increasing demand for accuracy and scope of remote sensing applications.

In practice, the radiating molecule is usually not isolated but diluted in a mixture at significant total pressure. The collisions among the molecules composing the gas can have a large influence on the spectral shape, affecting all wavelength regions through various mechanisms. These must be taken into account for the correct analysis and prediction of the resulting spectra.
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