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Collisional Energy Exchange In Polyatomic Molecules
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Book Synopsis Collisional Energy Exchange in Polyatomic Molecules by : S. B. Ryali
Download or read book Collisional Energy Exchange in Polyatomic Molecules written by S. B. Ryali and published by . This book was released on 1983 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fourier Transform Infrared Spectrometry (FTIS) has been used to study several kinds of gas-gas and gas-surface collision processes brought about with and in supersonic free jets in vacuo. Following are some key results: (1) Terminal distributions of rotational energy in free jets of carbon monoxide and carbon dioxide show a non-Boltzmann distribution that can be characterized by a two-temperature model and explained in terms of competition between rotation-rotation and rotation translation transfers. (2) Spectra of CO2 molecules excited by collisions with nitrogen molecules indicated similar two-temperature distributions, possibly due to secondary collisions between excited CO2 and N2. (3) The accommodation of vibrational and rotational energy during collisions between CO, CO2 and NO molecules and hot platinum surfaces has been determined over a range of surface temperatures. (4) Excess internal energies have been determined in nascent CO and CO2 molecules formed respectively by catalytic oxidation of C and CO on a platinum surface. An energy balance indicates that about 1/3 of the available reaction energy is absorbed by the surface, the remainder going mostly into vibrational modes of product molecules.
Book Synopsis State-Resolved Collisional Energy Transfer in Highly Vibrationally Excited Polyatomic Molecules by :
Download or read book State-Resolved Collisional Energy Transfer in Highly Vibrationally Excited Polyatomic Molecules written by and published by . This book was released on 1992 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transfer of energy in isolated or colliding molecules is a fundamental process with practical consequences for complex phenomena occurring in atmospheric chemistry, combustion, molecular lasers, plasmas, and a host of other environments containing energetic species. We have developed a technique that combines vibrational overtone excitation, to prepare highly vibrationally excited initial states, and time-resolved spectroscopic detection, to probe the evolution of the prepared state, for studying energy transfer in vibrationally energized molecules. We have used this approach to determine directly, for the first time, the frequencies of the three ungerade vibrations in the first electronically excited state of acetylene. Using this information we have characterized highly vibrationally excited states of acetylene and directly the frequencies and rotational constants of the perturbing vibrational states at these energies. Combining these spectroscopic insights on the vibrationally and electronically excited states of acetylene has allowed us to determine the energy transfer rates and pathways in the collisional relaxation of a polyatomic molecule containing 10,000 cm-1 of vibrational energy, Rotational energy transfer is very rapid, occurring on about every other collision, but is essentially unaffected by the identity of the vibrational state in which the rotational relaxation occurs.
Book Synopsis Collisional Energy Transfer in Highly Vibrationally Excited Polyatomic Molecules by : F. F. Crim
Download or read book Collisional Energy Transfer in Highly Vibrationally Excited Polyatomic Molecules written by F. F. Crim and published by . This book was released on 1988 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three objectives of this work are to determine the nature of highly vibrationally excited polyatomic molecule, to determine the rate constants and pathways for the collisional relaxation of these molecules, and to probe the electronic spectroscopy of these molecules. We have created and implemented approaches for accomplishing these objectives and have demonstrated their feasibility by studying the collisional energy transfer in highly vibrational excited acetylene. We have found that the collisional self relaxation rates of single angular momentum states with 10,000/cm of vibrational energy are a substantial fraction of the gas kinetic collision rates. The rate constant is about a factor of two smaller for relaxation by atomic partners. Molecular energy transfer, Vibrational energy transfer. (MJM).
Book Synopsis Collisional Energy Transfer from Highly Vibrationally Excited Polyatomic Molecules by : Kieran Fergus Lim
Download or read book Collisional Energy Transfer from Highly Vibrationally Excited Polyatomic Molecules written by Kieran Fergus Lim and published by . This book was released on 1988 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Richard Barry Bernstein Publisher :Springer Science & Business Media ISBN 13 :1461329132 Total Pages :785 pages Book Rating :4.4/5 (613 download)
Book Synopsis Atom - Molecule Collision Theory by : Richard Barry Bernstein
Download or read book Atom - Molecule Collision Theory written by Richard Barry Bernstein and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 785 pages. Available in PDF, EPUB and Kindle. Book excerpt: The broad field of molecular collisions is one of considerable current interest, one in which there is a great deal of research activity, both experi mental and theoretical. This is probably because elastic, inelastic, and reactive intermolecular collisions are of central importance in many of the fundamental processes of chemistry and physics. One small area of this field, namely atom-molecule collisions, is now beginning to be "understood" from first principles. Although the more general subject of the collisions of polyatomic molecules is of great im portance and intrinsic interest, it is still too complex from the viewpoint of theoretical understanding. However, for atoms and simple molecules the essential theory is well developed, and computational methods are sufficiently advanced that calculations can now be favorably compared with experimental results. This "coming together" of the subject (and, incidentally, of physicists and chemists !), though still in an early stage, signals that the time is ripe for an appraisal and review of the theoretical basis of atom-molecule collisions. It is especially important for the experimentalist in the field to have a working knowledge of the theory and computational methods required to describe the experimentally observable behavior of the system. By now many of the alternative theoretical approaches and computational procedures have been tested and intercompared. More-or-Iess optimal methods for dealing with each aspect are emerging. In many cases working equations, even schematic algorithms, have been developed, with assumptions and caveats delineated.
Book Synopsis Molecular Processes in Plasmas by : Yukikazu Itikawa
Download or read book Molecular Processes in Plasmas written by Yukikazu Itikawa and published by Springer Science & Business Media. This book was released on 2007-07-19 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of plasmas include molecules rather than only ions or atoms. Examples are ionospheres of the Earth and other planets, stellar atmospheres, gaseous discharges for use in various devices and processes, and fusion plasmas in the edge region. This book describes the role of molecules in those plasmas by showing elementary collision processes involving those molecules.
Book Synopsis Information Theoretic Analysis of Multiphoton Excitation and Collisional Deactivation in Polyatomic Molecules by :
Download or read book Information Theoretic Analysis of Multiphoton Excitation and Collisional Deactivation in Polyatomic Molecules written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The procedure of maximal entropy is applied to characterize the three distributions over energy states which are of direct interest for studies of multiple photon excitation of polyatomic molecules. These distributions are the original population of the different energy states given the mean number of photons absorbed, the distribution over the final energy states after a single collision, given a well defined initial energy state and the mean energy transfer per collision, and the time evolution of the population of the different energy states due to collisional deactivation, given the mean energy transfer per collision. Good agreement with experimentally determined values of (.delta.E), the average amount of energy removed in a collision, are obtained for deactivation of sec-butyl, cyclohexane, .beta.-hexyl, and .beta.-naphthylamine by structureless collision partners such as He or H/sub 2/. The vibrational relaxation surprisal parameter is found to be lambda/sub 1/ approximately equal to 0.1 for all these systems. This is much closer to a statistical, or strong-collision limit, than vibrational deactivation of diatomics by atoms, for which lambda/sub 1/ is approximately equal to 1.0. Deactivation most likely proceeds through a sequence of maximal-entropy distributions.
Book Synopsis Intermolecular Energy Transfer, Collisional Transition Probabilities for Polyatomic Molecules at High Levels of Vibrational Excitation by : B. S. Rabinovitch
Download or read book Intermolecular Energy Transfer, Collisional Transition Probabilities for Polyatomic Molecules at High Levels of Vibrational Excitation written by B. S. Rabinovitch and published by . This book was released on 1969 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report summarizes the experimental and theoretical accomplishment under a program which dealing with collisional activation and deactivation of polyatomic molecules at the levels of vibrational excitation which correspond to chemical reaction. (Author).
Book Synopsis The Transfer of Molecular Energies by Collision: Recent Quantum Treatments by : F. A. Gianturco
Download or read book The Transfer of Molecular Energies by Collision: Recent Quantum Treatments written by F. A. Gianturco and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: I I These Lecture Notes are intended as an introduction to the theoretical formulation and computational aspects of the molecular energy transfer processes which take place in an increasingly sophisticated range of molecular scattering experiments. They are directed to chemistry graduate students and emphasize the quantum mechanical approach, with little or no attention to classical and semi classical treatments or to formal presentations. Several Sections of the first Chapters are based on lectures given at the Graduate School of Physics of the University of Genoa a few years ago and I thank the students for their sense of duty in following to the end all those no tation-filled blackboards and transparencies. The kind patience of my wife Carolyn in reading the whole manuscript and improving its form is gratefully acknowledged. Franco A. Gianturco Bari, September 1978 CON TEN T S FOREWORD I NTRODUCTI ON Page 1. A RESUME OF QUANTUM MECHANICAL POTENTIAL SCATTERING 1. 1. General formulation of the problem Page 5 1. 2. Solutions of the radial equation 10 " 1. 3. The method of partial waves 13 1. 4. Some properties of 61. The Born appro~imation 18 1. 5. Properties of the S-matrix: bound states and resonances 23 1. 6. Classical and semiclassical scattering,a set of defi- tions 34 References 44 2. POTENTIAL ENERGY HYPERSURFACE CALCULATIONS FOR SIMPLE SYSTEMS 2. 1. Kinematic considerations 45 2. 2. General development of a priori method 52 2. 3. Some approximate treatments 68 2. 4.
Book Synopsis Studies in Collisional Energy Transfer of Highly Rotationally and Vibrationally Excited Molecules by : Trevor C. Brown
Download or read book Studies in Collisional Energy Transfer of Highly Rotationally and Vibrationally Excited Molecules written by Trevor C. Brown and published by . This book was released on 1988 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the studies made on several unimolecular reaction systems in order to obtain collisional energy transfer information on highly excited polyatomic molecules. Pressure-dependant very low-pressure pyrolysis (VLPP) and infrared multiphoton decomposition (IRMPD) experimental techniques are used.
Book Synopsis Rotational Energy Transfer in Polyatomic Molecules by : Zaid Rawi
Download or read book Rotational Energy Transfer in Polyatomic Molecules written by Zaid Rawi and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vibrational-Translational Energy Transfer in Atom-Polyatomic Molecule Collisions in Thermal Reaction Systems by : I. Oref
Download or read book Vibrational-Translational Energy Transfer in Atom-Polyatomic Molecule Collisions in Thermal Reaction Systems written by I. Oref and published by . This book was released on 1977 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibrational-translational energy transfer probabilities and collisional efficiencies are calculated for atom-polyatomic molecule collisions. It is assumed that a collision complex is formed and that the total internal vibrational energy is statistically distributed among all the modes of the complex. An attractive potential is assumed and account is taken of the centrifugal barrier. Conservation of system angular momentum is imposed. Convolution of the several thermal distribution functions is carried out and completeness and detailed balance are observed. Comparison of calculated quantum statistical quantities with experiment is made for the thermal isomerization of methyl and ethyl isocyanide in the presence of heavy atomic bath gases, such as Xe or Ar, and semiquantitative agreement is found. (Author).
Book Synopsis Introduction to Molecular Energy Transfer by : James Yardley
Download or read book Introduction to Molecular Energy Transfer written by James Yardley and published by Elsevier. This book was released on 2012-12-02 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Molecular Energy Transfer intends to provide an elementary introduction to the subject of molecular energy transfer and relaxation. The book covers the foundation of molecular energy transfer such as quantum mechanics; the vibrational state of molecules; and vibrational energy transfer and the experimental methods for its study. Coverage also includes the different kinds of energy transfer in gases; vibrational relaxation in condensed phases; electronic states and interactions; electronic energy as a result of intermolecular interaction; radiationless electronic transition; and rotational energy transfer. The text is recommended for students, graduates, and researchers in the fields of physics and chemistry, especially those who would like to know more about molecular energy transfer.
Book Synopsis Collisional Molecular Energy Transfer Characteristic of Combustion by : B. S. Rabinovitch
Download or read book Collisional Molecular Energy Transfer Characteristic of Combustion written by B. S. Rabinovitch and published by . This book was released on 1973 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report summarizes the experimental and theoretical accomplishment under this program which deals with collisional energy transfer involving polyatomic molecules at high vibrational levels characteristic of reaction and combustion. (Author).
Book Synopsis Internal Rotation in Glyoxal and Collision Dynamics in Large Polyatomic Molecules by : Kirk William Butz
Download or read book Internal Rotation in Glyoxal and Collision Dynamics in Large Polyatomic Molecules written by Kirk William Butz and published by . This book was released on 1990 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Chemical Reaction Dynamics by : Antonio Laganà
Download or read book Theory of Chemical Reaction Dynamics written by Antonio Laganà and published by Springer Science & Business Media. This book was released on 2006-03-28 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, held in Balatonföldvár, Hungary, 8-12 June 2003
Book Synopsis Collisional Activation in Gases by : Brian Stevens
Download or read book Collisional Activation in Gases written by Brian Stevens and published by Pergamon. This book was released on 1967 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
