Determination of Stepsize Parameters for Intermolecular Vibrational Energy Transfer. Final Report, May 1, 1987--December 31, 1991 PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 38
Book Description
Intermolecular energy transfer of highly excited polyatomic molecules plays an important role in many complex chemical systems: combustion, high temperature and atmospheric chemistry. By monitoring the relaxation of internal energy we have observed trends in the collisional efficiency for energy transfer as a function of the substrates̀ excitation energy and the complexities of substrate and deactivator. For a given substrate? increases as the deactivators̀ mass increase to -30 amu and then exhibits a nearly constant value; this is due to a mass mismatch between the atoms of the colliders. In a homologous series of substrate molecules (C3-C)? decreases as the number of atoms in the substrate increases; replacing F with H increases?. All substrates, except for CF2Cl2 and CF2HCl below 10,000 cm−1, exhibited that? is independent of energy, i.e. ?E{sub all} is linear with energy. The results are interpreted with a simple model which considers that? is a function of the ocillators energy and its vibrational frequency. Limitations of current approximations used in high temperature unimolecular reactions were evaluated and better approximations were developed. The importance of energy transfer in product yields was observed for the photoactivation of perfluorocyclopropene and the photoproduction of difluoroethyne. 3 refs., 18 figs., 4 tabs.
Author: Publisher: ISBN: Category : Languages : en Pages : 38
Book Description
Intermolecular energy transfer of highly excited polyatomic molecules plays an important role in many complex chemical systems: combustion, high temperature and atmospheric chemistry. By monitoring the relaxation of internal energy we have observed trends in the collisional efficiency for energy transfer as a function of the substrates̀ excitation energy and the complexities of substrate and deactivator. For a given substrate? increases as the deactivators̀ mass increase to -30 amu and then exhibits a nearly constant value; this is due to a mass mismatch between the atoms of the colliders. In a homologous series of substrate molecules (C3-C)? decreases as the number of atoms in the substrate increases; replacing F with H increases?. All substrates, except for CF2Cl2 and CF2HCl below 10,000 cm−1, exhibited that? is independent of energy, i.e. ?E{sub all} is linear with energy. The results are interpreted with a simple model which considers that? is a function of the ocillators energy and its vibrational frequency. Limitations of current approximations used in high temperature unimolecular reactions were evaluated and better approximations were developed. The importance of energy transfer in product yields was observed for the photoactivation of perfluorocyclopropene and the photoproduction of difluoroethyne. 3 refs., 18 figs., 4 tabs.
Author: J.R. Albani Publisher: Elsevier ISBN: 0080474489 Category : Science Languages : en Pages : 427
Book Description
Structure and Dynamics of Macromolecules: Absorption and Fluorescence Studies is clearly written and contains invaluable examples, coupled with illustrations that demonstrate a comprehensible analysis and presentation of the data. This book offers practical information on the fundamentals of absorption and fluorescence, showing that it is possible to interpret the same result in different ways. It is an asset to students, professors and researchers wishing to discover or use absorption and fluorescence spectroscopy, and to scientists working on the structure and dynamics of macromolecules. * Offers concise information on the fundamentals of absorption and fluorescence * Critically reviews examples taken from previously published literature * Highly illustrated, it is suitable for academic and institutional libraries and government laboratories
Author: Michele Kimble Publisher: Elsevier ISBN: 0080466826 Category : Technology & Engineering Languages : en Pages : 611
Book Description
Femtochemistry VII presents the most recent developments in femtochemistry and highlights the significance of the field today. This book contains extracts from the proceedings, presentations and posters from the Femtochemistry VII conference, held in Washington D.C., on July 17-22, 2005. The stimulating conference was opened by Professor Ahmed Zewail (1999 Nobel Prize Winner), and as was evident by the attendees at the conference, had a very active program with the presentation of numerous talks and a large number of posters. This collection of papers reflects the remarkable progress that has been made in femtosecond spectroscopy, and especially to its emergence as a field of research devoted to chemistry and biology, giving rise to femtochemistry and femtobiology. Subjects covered include imaging, structural dynamics, and spectroscopies, fundamentals of reaction dynamics, salvation phenomenta, liquids and interfaces, aggregates/particles/surfaces, protein dynamics and photobiology, quantum control, and intense laser-matter interactions. Subjects covered by this book include imaging, structural dynamics, and spectroscopies; fundamentals of reaction dynamics; salvation phenomenta; liquids and interfaces; aggregates/particles/surfaces; protein dynamics and photobiology; quantum control; and intense laser-matter interactions. This book would appeal to chemists, physicists and biologists in the fields of atomic and molecular science. * Contains the most recent developments in Femtochemistry from the Femtochemistry VII conference* Highlights the significance of femtochemistry today* Displays extracts from the proceedings, presentations and posters from the conference
Author: Christopher J. Cramer Publisher: John Wiley & Sons ISBN: 1118712277 Category : Science Languages : en Pages : 624
Book Description
Essentials of Computational Chemistry provides a balanced introduction to this dynamic subject. Suitable for both experimentalists and theorists, a wide range of samples and applications are included drawn from all key areas. The book carefully leads the reader thorough the necessary equations providing information explanations and reasoning where necessary and firmly placing each equation in context.
Author: Barbara Kirchner Publisher: Springer ISBN: 3319897942 Category : Science Languages : en Pages : 295
Book Description
The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field. The chapters “Ionic Liquid–Liquid Chromatography: A New General Purpose Separation Methodology”, “Proteins in Ionic Liquids: Current Status of Experiments and Simulations”, “Lewis Acidic Ionic Liquids” and "Quantum Chemical Modeling of Hydrogen Bonding in Ionic Liquids" are available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.
Author: Luis Arnaut Publisher: Elsevier ISBN: 0080469345 Category : Science Languages : en Pages : 563
Book Description
Chemical Kinetics bridges the gap between beginner and specialist with a path that leads the reader from the phenomenological approach to the rates of chemical reactions to the state-of-the-art calculation of the rate constants of the most prevalent reactions: atom transfers, catalysis, proton transfers, substitution reactions, energy transfers and electron transfers. For the beginner provides the basics: the simplest concepts, the fundamental experiments, and the underlying theories. For the specialist shows where sophisticated experimental and theoretical methods combine to offer a panorama of time-dependent molecular phenomena connected by a new rational. Chemical Kinetics goes far beyond the qualitative description: with the guidance of theory, the path becomes a reaction path that can actually be inspected and calculated. But Chemical Kinetics is more about structure and reactivity than numbers and calculations. A great emphasis in the clarity of the concepts is achieved by illustrating all the theories and mechanisms with recent examples, some of them described with sufficient detail and simplicity to be used in general chemistry and lab courses. * Looking at atoms and molecules, and how molecular structures change with time. * Providing practical examples and detailed theoretical calculations* Of special interest to Industrial Chemistry and Biochemistry
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Author: J.R. Albani
Author: Michele Kimble
Author: Christopher J. Cramer
Author: Barbara Kirchner
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Author: Luis Arnaut