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Collisional Effects On Molecular Spectra

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Collisional Effects on Molecular Spectra

Collisional Effects on Molecular Spectra Book
Author : Jean-Michel Hartmann,Christian Boulet,Daniel Robert
Publisher : Elsevier
Release : 2021-02-01
ISBN : 0128223642
Language : En, Es, Fr & De

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Book Description :

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 in molecular spectra, the book takes a threefold approach where it highlights key models, reviews available data, and discusses the consequences for applications. Areas covered include heat transfer, remote sensing, optical sounding, metrology, probing of gas media and climate predictions. An extensive bibliography and discussion of remaining problems and future directions complete the text. Gas phase molecular spectroscopy is a powerful tool for obtaining information on the geometry and internal structure of isolated molecules and the interactions that they undergo. It facilitates measurement, modeling and prediction of the influence of pressure (i.e.. of intermolecular collisions) on the spectra of gas molecules which must be taken into account for the correct analysis and prediction of the resulting spectra. In recent years, there have been considerable improvements in the field to meet the ever-increasing demand for accuracy and scope of applications. Drawing on the extensive experience of its expert authors, this book presents 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 developments in measuring, modeling and predicting the influence of pressure on the spectra of gas molecules, 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

Collisional Effects on Molecular Spectra

Collisional Effects on Molecular Spectra Book
Author : Jean-Michel Hartmann,Christian Boulet,Daniel Robert
Publisher : Elsevier
Release : 2008-08-12
ISBN : 9780080569949
Language : En, Es, Fr & De

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Book 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 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

Collisional Effects on Molecular Spectra

Collisional Effects on Molecular Spectra Book
Author : Jean-Michel Hartmann,Christian Boulet,Daniel Robert
Publisher : Elsevier
Release : 2021-01-12
ISBN : 0128227362
Language : En, Es, Fr & De

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Book Description :

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

Collisional Effects in Atomic Spectra

Collisional Effects in Atomic Spectra Book
Author : M. Harris,Newcastle upon Tyne Univ. (GB)
Publisher : Unknown
Release : 1985
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Collisional Effects in Atomic Spectra book written by M. Harris,Newcastle upon Tyne Univ. (GB), available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Theory of Saturation Spectroscopy Including Collisional Effects

Theory of Saturation Spectroscopy Including Collisional Effects Book
Author : P. R. Berman,P. F. Liao,J. E. Bjorkholm,NEW YORK UNIV N Y DEPT OF PHYSICS.
Publisher : Unknown
Release : 1979
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

A theory of saturation spectroscopy in three-level gas vapor systems, including collisional effects, is presented. Using a model of collisions in which they are phase-interrupting in their effect on level coherences and velocity-changing in their effect on level population densities, we calculate the absorption profile of a weak probe field on a given transition when an arbitrarily strong pump field acts on a coupled transition. Line shapes are derived for an arbitrary collision kernel describing the velocity-changing collisions, and these line shapes are evaluated for the collision kernel proposed by Keilson and Storer. Various limiting forms for the line shapes are derived and representative line shapes are displayed. Several new features of the line shapes, including collisionally-induced increased probe absorption are discussed. The line shapes are seen to reflect the various collisional processes that may occur in atomic or molecular systems. (Author).

Molecular and Laser Spectroscopy

Molecular and Laser Spectroscopy Book
Author : Zu-Geng Wang,Hui-Rong Xia
Publisher : Springer Science & Business Media
Release : 2012-12-06
ISBN : 3642837182
Language : En, Es, Fr & De

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Book Description :

The spectra of molecules containing more than one atom are necessarily of single atoms. They are correspondingly much more complex than those richer, not only in the number of spectral lines, but also in qualitatively different phenomena which do not have any counterpart in single atoms. Historically, molecular spectra have revealed much fundamental phy sics, such as the connection between nuclear spin statistics. They have pro vided models of physical systems which have been useful in quite different areas, such as particle physics. Most especially, molecular spectra are of fundamental importance in understanding chemical bonding. They reveal not only bond lengths but also the strength of the bonding potential between atoms. Moreover, these measurements are obtained for electronic excited states, as well as for the ground state, and for unstable short-lived molecules. In recent years, tunable lasers have provided powerful tools for the measurement and analysis of molecular spectra. Even before that, molecules were being used in lasers, most notably in the carbon dioxide laser, which finds many industrial applications.

Molecular Spectroscopy

Molecular Spectroscopy Book
Author : R F Barrow,Derek A Long,J Sheridan
Publisher : Royal Society of Chemistry
Release : 2007-10-31
ISBN : 1847556736
Language : En, Es, Fr & De

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Book Description :

Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.

Combined Radiative and Collisional Effects in the Spectrum of Ytterbium

Combined Radiative and Collisional Effects in the Spectrum of Ytterbium Book
Author : Mark James Wood,Newcastle upon Tyne Univ. (GB),University of Newcastle upon Tyne. Department of Physics
Publisher : Unknown
Release : 1996
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Combined Radiative and Collisional Effects in the Spectrum of Ytterbium book written by Mark James Wood,Newcastle upon Tyne Univ. (GB),University of Newcastle upon Tyne. Department of Physics, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Molecular Spectroscopy

Molecular Spectroscopy Book
Author : R. F. Barrow,Derek A. Long,D. J. Millen
Publisher : Royal Society of Chemistry
Release : 1974-01-01
ISBN : 085186516X
Language : En, Es, Fr & De

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Book Description :

Reflecting the growing volume of published work in this field, researchers will find this book an invaluable source of information on current methods and applications.

Collisional Effects in the Absorption Spectra of the Oxygen a Band and Nitric Oxide Fundamental Band

Collisional Effects in the Absorption Spectra of the Oxygen a Band and Nitric Oxide Fundamental Band Book
Author : Robert S. Pope
Publisher : Unknown
Release : 1998-12
ISBN : 9781423553922
Language : En, Es, Fr & De

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Book Description :

Fourier transform spectroscopy was used to measure pressure broadening coefficients in the absorption spectra of both the oxygen A band and the nitric oxide fundamental band. Oxygen spectra were recorded with O2, N2, CO, CO2, SF6 and noble gas collision partners, while nitric oxide spectra were recorded using noble gas collision partners. Pressure broadening coefficients were determined in the P and R branches for every resolved line for each of the fifteen collision pairs studied. In addition, broadening coefficients and qualitative evidence of line coupling were found for the Q branch of NO + Ar and pressure-induced line shifting coefficients were measured for O2 + Xe. Elastic and inelastic theories of pressure broadening were used to interpret the observed broadening coefficients. The elastic model showed a strong correlation between the magnitude of the coefficients and the polarizability and mass of the perturber. The inelastic contribution to pressure broadening was modeled using both angular-momentum-based and energy-based fitting laws. The ECS-P and EPGL-O laws provided the best fits to the data. The results indicate that the inelastic component is an important contribution to collisional broadening in diatomic molecules and that angular-momentum transfer is a plausible governing mechanism for the inelastic collisions.

Collision induced Absorption in Gases

Collision induced Absorption in Gases Book
Author : Lothar Frommhold
Publisher : Cambridge University Press
Release : 2006-05-18
ISBN : 9780521019675
Language : En, Es, Fr & De

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Book Description :

This book reviews the theory and experiment of collision-induced absorption of infrared radiation in dense gases. Throughout the book, the emphasis is on absorption by binary molecular complexes, but the onset of many-body effects, such as ternary spectral components and intercollisional processes, are also considered in detail.

Spectra of Atoms and Molecules

Spectra of Atoms and Molecules Book
Author : Peter F. Bernath
Publisher : Oxford University Press, USA
Release : 2020
ISBN : 0190095407
Language : En, Es, Fr & De

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Book Description :

"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"--

Astronomical Spectroscopy An Introduction To The Atomic And Molecular Physics Of Astronomical Spectroscopy Third Edition

Astronomical Spectroscopy  An Introduction To The Atomic And Molecular Physics Of Astronomical Spectroscopy  Third Edition  Book
Author : Tennyson Jonathan
Publisher : World Scientific
Release : 2019-04-18
ISBN : 1786346966
Language : En, Es, Fr & De

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Book Description :

The third edition of Astronomical Spectroscopy examines the physics necessary to understand and interpret astronomical spectra. It offers a step-by-step guide to the atomic and molecular physics involved in providing astronomical spectra starting from the relatively simple hydrogen atom and working its way to the spectroscopy of small molecules.Based on UCL course material, this book uses actual astronomical spectra to illustrate the theoretical aspects of the book to give the reader a feel for such spectra as well as an awareness of what information can be retrieved from them. It also provides comprehensive exercises, with answers given, to aid understanding.

Chemical Modelling

Chemical Modelling Book
Author : Michael Springborg
Publisher : Royal Society of Chemistry
Release : 2012-11-08
ISBN : 1849734798
Language : En, Es, Fr & De

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Book Description :

Chemical Modelling: Applications and Theory comprises critical literature reviews of all aspects of molecular modelling. Molecular modelling in this context refers to modelliing the structure, properties and reactions of atoms, molecules and materials. Each chapter provides a selective review of recent literature, incorporating sufficient historical perspective for the non-specialist to gain an understanding. With chemical modelling covering such a wide range of subjects, this Specialist Periodical Report serves as the first port of call to any chemist, biochemist, materials scientist or molecular physicist needing to acquaint themselves with major developments in the area.

Theory of High Intensity Multimode Gas Lasers Inclusion of Collisional Effects

Theory of High Intensity Multimode Gas Lasers   Inclusion of Collisional Effects Book
Author : Paul R. Berman,NEW YORK UNIV N Y DEPT OF PHYSICS.
Publisher : Unknown
Release : 1977
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Several topics in laser theory and the interaction of radiation with matter have been addressed. First, a mathematical theory of a high intensity single mode gas laser has been developed. New computational techniques have been applied which serve to unite several previous approaches to single mode laser theory. A generalized dressed atom approach was formulated to provide a new way of viewing the physical processes occurring when high intensity fields interact with matter. Second, a theoretical study of the manner in which laser sepctroscopy can be used to probe collision effects in atomic and molecular systems has been undertaken. Both two and three level systems were studied; steady state and coherent transient techniques were examined. It is now apparent that laser spectroscopy will be a useful tool for the determination of various excited state differential and total cross sections. (Author).

Collisional and Radiative Effects in Atomic Spectra

Collisional and Radiative Effects in Atomic Spectra Book
Author : Ian Shannon,Newcastle upon Tyne Univ. (GB).
Publisher : Unknown
Release : 1986
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Collisional and Radiative Effects in Atomic Spectra book written by Ian Shannon,Newcastle upon Tyne Univ. (GB)., available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Molecular Spectroscopy Spectroscopy of the Earth s atmosphere and interstellar medium

Molecular Spectroscopy  Spectroscopy of the Earth s atmosphere and interstellar medium Book
Author : K. Narahari Rao,C. Weldon Mathews
Publisher : Unknown
Release : 1972
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Molecular Spectroscopy Spectroscopy of the Earth s atmosphere and interstellar medium book written by K. Narahari Rao,C. Weldon Mathews, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Collisional and Radiative Effects in Atomic Spectra

Collisional and Radiative Effects in Atomic Spectra Book
Author : Daryl Szebesta
Publisher : Unknown
Release : 1990
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Collisional and Radiative Effects in Atomic Spectra book written by Daryl Szebesta, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports Book
Author : Anonim
Publisher : Unknown
Release : 1989
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Scientific and Technical Aerospace Reports book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Molecular Spectra and Molecular Structure Spectra of diatomic molecules

Molecular Spectra and Molecular Structure  Spectra of diatomic molecules Book
Author : Gerhard Herzberg
Publisher : Unknown
Release : 1950
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Molecular Spectra and Molecular Structure Spectra of diatomic molecules book written by Gerhard Herzberg, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.