Collisional Effects on Molecular Spectra
：Laboratory Experiments and Models, Consequences for Applications
Publication subTitle ：Laboratory Experiments and Models, Consequences for Applications
Author： Hartmann Jean-Michel;Boulet Christian;Robert Daniel
Publisher： Elsevier Science
Publication year： 2008
E-ISBN: 9780080569949
P-ISBN(Paperback): 9780444520173
P-ISBN(Hardback): 9780444520173
Subject： O4 Physics;O562 atomic physics;O657 instrumental analysis (physical and chemical analysis)
Language： ENG
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Description
Gas phase molecular spectroscopy is a powerful tool for obtaining information on the geometry and internal 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.
This book reviews our current experimental and theoretical knowledge and the practical consequences of collisional effects on molecular spectral shapes in neutral gases. General expressions are first given. They are formal of difficult use for practical calculations often but enable discussion of the approximations leading to simplified situations. The first case examined is that of isolated transitions, with the usual pressure broadening and shifting but also refined effects due to speed dependence and collision-induced velocity changes. Collisional line-mixing, which invalidates t
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