| Edition |
1st ed. |
| Description |
1 online resource : illustrations |
|
text txt rdacontent |
|
computer c rdamedia |
|
online resource cr rdacarrier |
| Summary |
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 troughs between 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. |
| Contents |
I. Introduction -- II. General Equations -- III. Isolated Lines -- IV. Collisional Line-Mixing (within clusters of lines) -- V. The Far Wings (beyond the impact approximations) -- VI. Collision Induced Absorption and Light Scattering -- VII. Consequences for Applications -- VIII. Towards Future Researches. |
| Bibliography |
Includes bibliographical references (pages 365-407) and index. |
| Subject |
Molecular spectroscopy.
|
|
Collision spectroscopy.
|
|
Molecular structure.
|
|
Spectroscopie moléculaire.
|
|
Spectroscopie de collision.
|
|
Structure moléculaire.
|
|
molecular structure.
|
|
SCIENCE -- Physics -- Atomic & Molecular.
|
|
Collision spectroscopy
|
|
Molecular spectroscopy
|
|
Molecular structure
|
|
Molekülspektroskopie
|
|
Molekülstruktur
|
| Added Author |
Boulet, C. (Christian)
|
|
Robert, Daniel.
|
| Other Form: |
Print version: Hartmann, Jean-Michel. Collisional effects on molecular spectra. 1st ed. 9780444520173 (OCoLC)225875772 |
| ISBN |
9780080569949 (e-book) |
|
0080569943 (e-book) |
|
1281795712 |
|
9781281795717 |
|
9786611795719 |
|
6611795715 |
|
0444520171 |
|
9780444520173 |
| Standard No. |
AU@ 000055626116 |
|
CHDSB 005985872 |
|
DEBBG BV039831478 |
|
DEBBG BV042307197 |
|
DEBSZ 430692447 |
|
NZ1 13068781 |
|
