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Author : Chris Arthur Michaels
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.:/5 (834 download)
Download or read book The Collisional Relaxation of Highly Vibrationally Excited Molecules written by Chris Arthur Michaels and published by . This book was released on 1997 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Min Zhang
Publisher :
ISBN 13 :
Total Pages : 145 pages
Book Rating : 4.:/5 (259 download)
Download or read book Collision-induced Vibration Relaxation of Highly Vibrationally Excited Molecules written by Min Zhang and published by . This book was released on 2007 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. Fleming Crim
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (227 download)
Download or read book Collisional Energy Transfer in Highly Vibrationally Excited Molecules written by F. Fleming Crim and published by . This book was released on 1981 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combining the techniques of direct excitation of overtone vibrations and time resolved spectroscopic detection permits detailed measurements of the vibrational and rotational relaxation of highly vibrationally excited molecules. Using this technique, we have measured vibrational and rotational relaxation in HF(v=3,4,5,). By observing near-infrared fluorescence, we determine the self-relaxation probabilities for HF(v=3,4,5) to be 0.19, 0.47, and 0.97, respectively, and find that the rates decrease more rapidly with temperature in these high levels than for v=1. Using laser double resonance to probe individual rotational states, we find phenomenological rotational relaxation rate constants which decrease montonically with rotational energy change in the vibrationally excited molecule. (Author).
Author : Jerrell D. Brenner
Publisher :
ISBN 13 :
Total Pages : 412 pages
Book Rating : 4.3/5 (91 download)
Download or read book Highly Vibrationally Excited Aromatic Molecules written by Jerrell D. Brenner and published by . This book was released on 1995 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. F. Crim
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (227 download)
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).
Author : Xueming Yang
Publisher :
ISBN 13 :
Total Pages : 480 pages
Book Rating : 4.:/5 (818 download)
Download or read book Spectroscopy and Collisional Dynamics of Highly Vibrationally Excited Molecules written by Xueming Yang and published by . This book was released on 1991 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (227 download)
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.
Author : Amy S. Mullin
Publisher :
ISBN 13 :
Total Pages : 352 pages
Book Rating : 4.3/5 (91 download)
Download or read book Highly Excited Molecules written by Amy S. Mullin and published by . This book was released on 1997 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrating both theoretical and experimental approaches, this unique book examines transition states and chemical reactivity, and will be a useful tool for anyone studying the chemical dynamics, nature, and behavior of molecules in an excited state. The subject has important applications in atmospheric chemistry, plasmas, high-temperature materials processing, combustion, photosynthesis, detonation, and explosives.
Author :
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (727 download)
Download or read book Collision Dynamics of Methyl Radicals and Highly Vibrationally Excited Molecules Using Crossed Molecular Beams written by and published by . This book was released on 1991 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vibrational to translational (V-->T) energy transfer in collisions between large highly vibrationally excited polyatomics and rare gases was investigated by time-of-flight techniques. Two different methods, UV excitation followed by intemal conversion and infrared multiphoton excitation (IRMPE), were used to form vibrationally excited molecular beams of hexafluorobenzene and sulfur hexafluoride, respectively. The product translational energy was found to be independent of the vibrational excitation. These results indicate that the probability distribution function for V-->T energy transfer is peaked at zero. The collisional relaxation of large polyatomic molecules with rare gases most likely occurs through a rotationally mediated process. Photodissociation of nitrobenzene in a molecular beam was studied at 266 nm. Two primary dissociation channels were identified including simple bond rupture to produce nitrogen dioxide and phenyl radical and isomerization to form nitric oxide and phenoxy radical. The time-of-flight spectra indicate that simple bond rupture and isomerization occurs via two different mechanisms. Secondary dissociation of the phenoxy radicals to carbon monoxide and cyclopentadienyl radicals was observed as well as secondary photodissociation of phenyl radical to give H atom and benzyne. A supersonic methyl radical beam source is developed. The beam source configuration and conditions were optimized for CH3 production from the thermal decomposition of azomethane. Elastic scattering of methyl radical and neon was used to differentiate between the methyl radicals and the residual azomethane in the molecular beam.
Author : Margaret Bruehl
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (717 download)
Download or read book Theoretical Studies of the Collisional Relaxation of Highly Vibrationally Excited CS2 written by Margaret Bruehl and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Qingnan Liu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (458 download)
Download or read book Collisional Quenching Dynamics and Reactivity of Highly Vibrationally Excited Molecules written by Qingnan Liu and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chris A. Michaels
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.:/5 (385 download)
Download or read book The Collisional Relaxation of Highly Vibrationally Exited Molecules written by Chris A. Michaels and published by . This book was released on 1997 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relaxation of H2 Vibrational Motion by Wall Collisions written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The method of computer molecular dynamics was applied to an important technological problem where experimental data may be extremely difficult to obtain: collisional de-excitation at surfaces of vibrationally highly excited hydrogen molecules. The calculations have been carried out primarily for vibrational states about the v = 6 level. The technique is illustrated by means of a specific example and the detail that can be obtained from such calculations concerning the dynamics of the interaction is shown. Molecular states excited to the v = 4, v = 6, and v = 11 vibrational levels and the J = 1 rotational level have been examined. The translational temperature of the molecules is chosen to be 500°K, and the wall is given thermal motion characteristic of a temperature of 500°K. Different angles of approach have been studied, and different impact points on the surface have been selected. After the first collision, the impact point becomes random because of the stochastic nature of subsequent molecular trajectories. For any given collision with the wall, the molecule may pick up or lose vibrational, rotational, and translational energy. Careful sampling and averaging of the results of many trajectory runs is needed in order to arrive at meaningful conclusions about the probability of de-excitation as a function of such parameters as the number of wall collisions, the residence time, the wall temperature, and the microscopic nature of the wall itself.
Author : F. F. Crim
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (227 download)
Download or read book Vibrational Relaxation Rates and Pathways in Highly Excited Molecules written by F. F. Crim and published by . This book was released on 1985 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The techniques of laser double resonance or near-infrared fluorescence detection in combination with direct excitation of overtone vibrations provide detailed data on the rates and pathways of collisional energy transfer in hydrogen fluoride and deuterium fluoride. These measurements yield the self-relaxation rate constants for HF(v=1,2,3,4,5) and DF(v=1,2). In addition, they determine the relative importance of the vibration-vibration and vibration-translation, rotation energy transfer pathways for v> or = 2 in both molecules. Applying these techniques at higher temperatures gives the self-relaxation rate constants between 300 and 700 K for HF(v=1-5). Using different partners permits the determination of the rate constants for collisional relaxation of HF(v=3,4,5) by H2, D2, CH4, CD4, and C02.
Author : Vladilen Stepanovich Letokhov
Publisher : CRC Press
ISBN 13 : 1000445127
Total Pages : 397 pages
Book Rating : 4.0/5 (4 download)
Download or read book Laser Spectroscopy of Highly Vibrationally Excited Molecules written by Vladilen Stepanovich Letokhov and published by CRC Press. This book was released on 2021-07-28 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser spectroscopy has been perfected over the last fifteen years to become a precise tool for the investigation of highly vibrationally excited molecules. Intense infrared laser radiation permits both the multiple-photon resonant excitation and the dissociation of polyatomic molecules. In this book, the latest results of some of the foremost Soviet researchers are published for the first time in the West. Laser Spectroscopy of Highly Vibrationally Excited Molecules contains a comprehensive study of both the experimental and theoretical aspects of the basic photophysical interactions that occur in these processes. The book first focuses on the nonlinear interaction between the resonant vibrational mode and the intense infrared field and then examines the nonlinear interaction between the vibrational modes themselves due to anharmonicity. These interrelated processes determine all the characteristics of polyatomic molecules in an infrared field. The book also discusses related phenomena such as spectra broadening, optical resonance, photon echoes, and dynamical chaos. It includes examples of multiple-photon resonant excitation such as the excitation of OsO4 by CO^O2 laser radiation, which is detected by the visible luminescence that results. This book will be of great interest to researchers and postgraduate students in infrared laser spectroscopy and the laser chemistry of molecules and applications of isotope separation.
![Download Low Energy Collision Induced Vibrational Relaxation in B3II+Ou [excited Electronic State] Iodine PDF Online Free](https://books.google.com/books/content/images/frontcover/3pqHNAAACAAJ?fife=w200-h370)
Author : Andrew Boyd Rock
Publisher :
ISBN 13 :
Total Pages : 870 pages
Book Rating : 4.:/5 (222 download)
Download or read book Low Energy Collision Induced Vibrational Relaxation in B3II+Ou [excited Electronic State] Iodine written by Andrew Boyd Rock and published by . This book was released on 1996 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Understanding energy transfer processes is an essential prerequisite for the deep understanding of all chemical processes. This thesis investigates the process of vibrational relaxation (or deexcitation) of highly vibrationally and electronically excited molecular iodine (I2) induced by very low energy collisions in a supersonic free jet with six foreign gases. In an investigation of the state-to-field relaxation of I2 (B 3II+ou, v = 16) induced by collisions with He at temperatures of 2 to 12 K we find that the absolute relaxation rates are an order of magnitude smaller than those at 300 K and that the explanation of the magnitudes of these rates does not require enhancement due to low energy orbiting resonances. We find that the rates scale well with estimated collision encounter rates that account for the attractive part of the intermolecular potential. A second investigation with a much wider scope explores vibrational relaxation from v = 21 to 24 with six foreign gases: He, Ne, Ar, H2, D2 and N2. For this investigation a new type of experimental procedure has been designed and implemented that records a detailed and complete map of the fluorescence from B3II+ouI2 that is resolved with respect to both fluorescence frequency and time. These not only yield state-to-field rates, but coupled with a novel deconvolution method for growth curve fitting, yield absolute state-to-state rates for vibrational relaxation processes with Av=-1, -2, -3 and -4. The dependence of the relaxation rates on the collision partner, temperature and Av are discussed. An exponential dependence on the vibrational energy gap may be adequate to characterise the Av dependence of vibrational relaxation. The frequency resolution of the experimental data also reveals that some of the energy released by vibrational de-excitation is transferred to the rotation of the I2 molecule. We find this process is best characterised by an exponential dependence on the change of I2 angular momentum and that its extent scales with the mass of the collision partner. Measurements of the low-energy collision-induced quenching of B 3II+ouI2 are also reported for all six foreign gases. The possibility arises from the rates that the mechanism for quenching by H2 and D2 at low temperatures is different to that of the other gases and to that for H2 and D2 at high temperatures.00000000000000.
Author : Trevor C. Brown
Publisher :
ISBN 13 :
Total Pages : 338 pages
Book Rating : 4.:/5 (22 download)
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.
