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Books > Science & Mathematics > Physics > Atomic & molecular physics
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Collisional Effects on Molecular Spectra - Laboratory Experiments and Models, Consequences for Applications (Hardcover)
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Collisional Effects on Molecular Spectra - Laboratory Experiments and Models, Consequences for Applications (Hardcover)
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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 the notion of isolated transitions and has spectral
consequences when lines are closely spaced, is then discussed
within the impact approximation. Regions where the contributions of
many distant lines overlap, such as troughsbetween transitions and
band wings, are considered next. For a description of these far
wings the finite duration of collisions and concomitant breakdown
of the impact approximation must be taken into account. Finally,
for long paths or elevated pressures, the dipole or polarizability
induced by intermolecular interactions can make significant
contributions. Specific models for the description of these
collision induced absorption and light scattering processes are
presented.
The above mentioned topics are reviewed and discussed from a
threefold point of view: the various models, the available data,
and the consequences for applications including heat transfer,
remote sensing and optical sounding. The extensive bibliography and
discussion of some remaining problems complete the text.
- State of the art on the subject
- A bibliography of nearly 1000 references
- Tools for practical calculations
- Consequences for other scientific fields
- Numerous illustrative examples
- Fulfilling a need since there is no equivalent monograph on the
subject
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