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Author: Dennis Allan Coombe
Publisher:
ISBN:
Category : Pressure broadening
Languages : en
Pages : 672
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Book Description
Author: Dennis Allan Coombe
Publisher:
ISBN:
Category : Pressure broadening
Languages : en
Pages : 672
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Book Description
Author: Jean-Michel Hartmann
Publisher: Elsevier
ISBN: 0080569943
Category : Science
Languages : en
Pages : 429
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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
Author: Jeffrey Steinfeld
Publisher: Springer Science & Business Media
ISBN: 1468423525
Category : Science
Languages : en
Pages : 543
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Book Description
The impact which has been made on spectroscopy by lasers, and by this route on major segments of physics and chemistry, has received ample documen tation in the past several years. Two principal themes emerge from examina tion of the numerous books and monographs now available on this subject: first, an increase in spectral resolution to levels previously undreamed of; and, second, the generation of nonlinear phenomena as a result of the intense radiation fields available from laser devices. There is one additional property of laser radiation which, although used extensively in experiments, does not appear to have been as thoroughly reviewed as the foregoing aspects. This is the spatial and temporal coherence of the radiation field produced by the laser, which makes possible the coherent excitation of molecular energy states. This feature is the subject of the present volume. While the use of coherence methods in spectroscopy has been paced by lasers, it is by no me ans restricted to this technology. In the second and fourth chapters, microwave sources are discussed as generators of coherent radiation fields and are used to probe both rotational energy levels and spin states of electronically excited molecules. The phenomena discussed in this book, such as nutation, free induction decay, radiative echoes, rapid pas sage, and so forth, are really the same in different regions of the spectrum, and themselves echo from one chapter to the next.
Author: Jeanna Buldyreva
Publisher: World Scientific
ISBN: 184816596X
Category : Science
Languages : en
Pages : 306
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Book Description
This book presents a comprehensive overview of the modern theory of spectral line broadening and shifting by pressure of atmospheric gases. It describes current semi-classical methods for calculating vibrotational line widths and shifts, including very recent modifications and new developments realised by the authors themselves. For most of the considered molecular systems, analytical formulae are also given, which enable the calculation of line broadening coefficients without the use of semi-classical methods. The results of calculations by various approaches are compared with experimental data available in the literature. Numerous appendices list theoretical expressions and parameters' values required for the writing of computer programs for calculation of line broadening and line shifting coefficients.The book is addressed to undergraduate and postgraduate students as well as to professional scientists and researchers working in the field of molecular physics, molecular spectroscopy, quantum chemistry and mathematical physics.
Author:
Publisher:
ISBN:
Category : Laser beams
Languages : en
Pages : 64
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Book Description
Author: M.L. Stitch
Publisher: Elsevier
ISBN: 1483290611
Category : Technology & Engineering
Languages : en
Pages : 605
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Book Description
Volume 4 of the Laser Handbook continues the high standard set by the first three volumes which were widely acclaimed by numerous reviewers in Science, Optical Spectra and Laser Technology, as presenting an outstanding contribution to the field of laser technology.
Author: Robert A. Fisher
Publisher: Academic Press
ISBN: 0323140114
Category : Technology & Engineering
Languages : en
Pages : 653
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Book Description
This book appears at a time of intense activity in optical phase conjugation. We chose not to await the maturation of the field, but instead to provide this material in time to be useful in its development. We have tried very hard to elucidate and interrelate the various nonlinear phenomena which can be used for optical phase conjugation.
Author: A. E. Siegman
Publisher: University Science Books
ISBN: 9780935702118
Category : Science
Languages : en
Pages : 1322
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Book Description
This is both a textbook and general reference on the subject of laser theory and basic laser principles. The book gives a detailed accurate treatment of laser physics which does not require a background in quantum mechanics.
Author: Daniel Malacara
Publisher: CRC Press
ISBN: 9780203908266
Category : Science
Languages : en
Pages : 1008
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Book Description
This handbook explains principles, processes, methods, and procedures of optical engineering in a concise and practical way. It emphasizes fundamental approaches and provides useful formulas and step-by-step worked-out examples to demonstrate applications and clarify calculation methods. The book covers refractive, reflective, and diffractive optical components; lens optical devices; modern fringe pattern analysis; optical metrology; Fourier optics and optical image processing; electro-optical and acousto-optical devices; spatial and spectral filters; optical fibers and accessories; optical fabrication; and more. It includes over 2,000 tables, flow charts, graphs, schematics, drawings, photographs, and mathematical expressions.
Author: Società italiana di fisica
Publisher: Elsevier Science & Technology
ISBN:
Category : Science
Languages : en
Pages : 482
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Book Description
