April 14, 2021

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Collisional Effects on Molecular Spectra

Collisional Effects on Molecular Spectra
Author : Jean-Michel Hartmann,Christian Boulet,Daniel Robert
Publisher : Elsevier
Release Date : 2008-08-12
Category : Science
Total pages :432
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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 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 1,000 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

Recent Advances in Collisional Effects on Spectra of Molecular Gases and Their Practical Consequences

Recent Advances in Collisional Effects on Spectra of Molecular Gases and Their Practical Consequences
Author : Anonim
Publisher : Unknown
Release Date : 2018
Category :
Total pages :129
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Highlights: A review on the progress made in the last decade on pressure effects on absorption shapes. High accuracy measurement techniques. Theories, models and available data for the absorption shapes. Consequences for remote sensing, metrology and heat transfer applications. Over 700 references. Abstract: We review progress, since publication of the book `` Collisional effects on molecular spectra: Laboratory experiments and models, consequences for applications" (Elsevier, Amsterdam, 2008), on measuring, modeling and predicting the influence of pressure ( ie of intermolecular collisions) on the spectra of gas molecules. We first introduce recently developed experimental techniques of high accuracy and sensitivity. We then complement the aforementioned book by presenting the theoretical approaches, results and data proposed (mostly) in the last decade on the topics of isolated line shapes, line-broadening and -shifting, line-mixing, the far wings and associated continua, and collision-induced absorption. Examples of recently demonstrated consequences of the progress in the description of spectral shapes for some practical applications (metrology, probing of gas media, climate predictions) are then given. Remaining issues and directions for future research are finally discussed.

Collisional Effects on Molecular Spectra

Collisional Effects on Molecular Spectra
Author : Jean-Michel Hartmann,Christian Boulet,Daniel Robert
Publisher : Elsevier
Release Date : 2021-01-12
Category : Science
Total pages :576
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Gas phase molecular spectroscopy is a powerful tool for obtaining information on the geometry and internal structure of isolated molecules and their interactions with others. It enables the understanding and description, through measurements and modeling, of the influence of pressure on light absorption, emission, and scattering by gas molecules, which must be taken into account for the correct analysis and prediction of the resulting spectra. Collisional Effects on Molecular Spectra: Laboratory Experiments and Models, Consequences for Applications, Second Edition provides an updated review of current experimental techniques, theoretical knowledge, and practical applications. After an introduction to collisional effects on molecular spectra, the book moves on by taking a threefold approach: it highlights key models, reviews available data, and discusses the consequences for applications. These include areas such as heat transfer, remote sensing, optical sounding, metrology, probing of gas media, and climate predictions. This second edition also contains, with respect to the first one, significant amounts of new information, including 23 figures, 8 tables, and around 700 references. Drawing on the extensive experience of its expert authors, Collisional Effects on Molecular Spectra: Laboratory Experiments and Models, Consequences for Applications, Second Edition, is a valuable guide for all those involved with sourcing, researching, interpreting, or applying gas phase molecular spectroscopy techniques across a range of fields Provides updated information on the latest advances in the field, including isolated line shapes, line-broadening and -shifting, line-mixing, the far wings and associated continua, and collision-induced absorption Reviews recently developed experimental techniques of high accuracy and sensitivity Highlights the latest practical applications in areas such as metrology, probing of gas media, and climate prediction

Spectra of Atoms and Molecules

Spectra of Atoms and Molecules
Author : Peter F. Bernath
Publisher : Oxford University Press, USA
Release Date : 2020
Category : Science
Total pages :544
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"This book is designed as a textbook to introduce advanced undergraduates and, particularly, new graduate students to the vast field of spectroscopy. It presumes that the student is familiar with the material in an undergraduate course in quantum mechanics. I have taken great care to review the relevant mathematics and quantum mechanics as needed throughout the book. Considerable detail is provided on the origin of spectroscopic principles. My goal is to demystify spectroscopy by showing the necessary steps in a derivation, as appropriate in a textbook. The digital computer has permeated all of science including spectroscopy. The application of simple analytical formulas and the nonstatistical graphical treatment of data are long dead. Modern spectroscopy is based on the matrix approach to quantum mechanics. Real spectroscopic problems can be solved on the computer more easily if they are formulated in terms of matrix operations rather than di erential equations. I have tried to convey the spirit of modern spectroscopy, through the extensive use of the language of matrices"--

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author : Anonim
Publisher : Unknown
Release Date : 1980
Category : Aeronautics
Total pages :129
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NASA Technical Translation

NASA Technical Translation
Author : Anonim
Publisher : Unknown
Release Date : 1959
Category : Aeronautics
Total pages :129
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Laser Photoionization Spectroscopy

Laser Photoionization Spectroscopy
Author : V. S. Letokhov
Publisher : Unknown
Release Date : 1987
Category : Laser spectroscopy
Total pages :353
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Molecular Spectroscopy of Dense Phases

Molecular Spectroscopy of Dense Phases
Author : Michel Grosmann,S. G. Elkomoss,J. Ringeissen
Publisher : Elsevier Science & Technology
Release Date : 1976
Category : Molecular spectra
Total pages :814
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Physics Briefs

Physics Briefs
Author : Anonim
Publisher : Unknown
Release Date : 1994
Category : Physics
Total pages :129
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Proceedings of the Tenth International Conference on Raman Spectroscopy

Proceedings of the Tenth International Conference on Raman Spectroscopy
Author : W. L. Peticolas,B. Hudson
Publisher : University of Oregon International Conference of
Release Date : 1986
Category : Science
Total pages :850
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Abstracts - Symposium on Molecular Spectroscopy

Abstracts - Symposium on Molecular Spectroscopy
Author : Anonim
Publisher : Unknown
Release Date : 1987
Category : Molecular spectra
Total pages :129
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Proceedings Sixth International Conference Boulder, Colorado, July 12–16, 1982

Proceedings Sixth International Conference Boulder, Colorado, July 12–16, 1982
Author : Keith Burnett
Publisher : Walter de Gruyter GmbH & Co KG
Release Date : 2019-05-20
Category : Science
Total pages :1071
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Canadian Journal of Physics

Canadian Journal of Physics
Author : Anonim
Publisher : Unknown
Release Date : 2009
Category : Physics
Total pages :129
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Molecular Spectroscopy: Modern Research

Molecular Spectroscopy: Modern Research
Author : K.N. Rao
Publisher : Elsevier
Release Date : 2012-12-02
Category : Science
Total pages :466
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Molecular Spectroscopy: Modern Research, Volume III is a collection of papers presented at the 40th Annual Molecular Spectroscopy Symposium, held at the Ohio State University. The contributors of this seven-chapter text cover the significant advances in molecular spectroscopic research and their application in chemistry. Chapters 1 and 2 discuss first the higher-order vibration-rotation interactions in molecules and then present formulas and an insight into the direction being taken in theoretical pursuits. Chapter 3 provides an extensive compilation of published intensity and collision broadening parameters derived from infrared spectra. This chapter also contains a detailed discussion using consistent notation of some of the methods commonly applied to extract such information from laboratory spectra. Chapter 4 examines a variety of laser systems and their application in investigations involving triatomic free radicals and ions, while chapter 5 considers the developments in the microwave spectroscopic studies on nonpolar molecules when their symmetry is reduced by isotopic substitution. Chapter 6 emphasizes the quasi-linear molecular problem to develop an appreciation of the symptoms of quasi-linearity and theoretical treatments thereof. This chapter also examines the increasing role of highly resolved spectra in the interpretation of various large-amplitude motions in molecules. Lastly, Chapter 7 describes the electric multipolar moments of hydrogen and its isotopes. Spectroscopists, chemists, and researchers will find this work invaluable.

Government Reports Announcements & Index

Government Reports Announcements & Index
Author : Anonim
Publisher : Unknown
Release Date : 1976
Category : Science
Total pages :129
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