Collisional Effects on Molecular Spectra: Laboratory Experiments and Models, Consequences for Applications – Ebook PDF Instant Delivery – ISBN(s): 9780128223642,0128223642

Product details:

• ISBN-10 ‏ : ‎ 0444520171
• ISBN-13 ‏ : ‎ 978-0444520173
• Author: Jean-Michel HARTMANN

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.
Table contents:

1. Introduction

2. General Equations

3. Isolated Lines

4. Collisional Line-Mixing within clusters of lines

5. The Far Wings: beyond the impact introduction

6. Collision-induced absorption and light scattering

7. Consequences for Applications

8. Laboratory experimental techniques

9. Towards Future Research
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