Author: Bernard Ryan FoyPublisher:
ISBN:
Category :
Languages : en
Pages : 280
Book Description
Rotational and Vibrational Energy Transfer in Methane
Author: Bernard Ryan FoyRotational Aspects of Vibrational Energy Transfer
Author: Paul Fredrick ZittelPublisher:
ISBN:
Category :
Languages : en
Pages : 260
Book Description
Molecular Energy Transfer in Gases
Author: Tom Leadbetter CottrellPublisher:
ISBN:
Category : Gas
Languages : en
Pages : 226
Book Description
Dynamics of Molecular Collisions
Author: W. MillerPublisher: Springer Science & Business Media
ISBN: 1475706448
Category : Science
Languages : en
Pages : 391
Book Description
Activity in any theoretical area is usually stimulated by new experimental techniques and the resulting opportunity of measuring phenomena that were previously inaccessible. Such has been the case in the area under consideration he re beginning about fifteen years aga when the possibility of studying chemical reactions in crossed molecular beams captured the imagination of physical chemists, for one could imagine investigating chemical kinetics at the same level of molecular detail that had previously been possible only in spectroscopic investigations of molecular stucture. This created an interest among chemists in scattering theory, the molecular level description of a bimolecular collision process. Many other new and also powerful experimental techniques have evolved to supplement the molecular be am method, and the resulting wealth of new information about chemical dynamics has generated the present intense activity in molecular collision theory. During the early years when chemists were first becoming acquainted with scattering theory, it was mainly a matter of reading the physics literature because scattering experiments have long been the staple of that field. It was natural to apply the approximations and models that had been developed for nuclear and elementary particle physics, and although some of them were useful in describing molecular collision phenomena, many were not.
Data Index for Energy Transfer Collisions of Atoms and Molecules, 1970-1979
Author: A Spectrophone Study of Vibrational Relaxation in Methane
Author: Wilbert Dale BreshearsPublisher:
ISBN:
Category : Methane
Languages : en
Pages : 154
Book Description
The spectrophone method for the study of vibrational relaxation has been claimed to possess a distinct advantage over the more commonly used ultrasonic techniques in that it permits the relaxation of the various infrared-active vibrational modes in a polyatomic molecule to be studied separately. A discussion of the rate equations governing the exchange of energy between several degrees of freedom in polyatomic gases is given which shows that the characteristic relaxation frequencies for such a system are completely independent of the method of excitation, indicating that the information which can be obtained using the spectrophone is essentially the same as that to be found from ultrasonic measurements. An expression is derived for the spectrophone frequency response to be expected from a polyatomic gas which predicts that at sufficiently high light-chopping frequencies an increased loss in the spectrophone signal due to relaxation phenomena should be observed. A study of the spectrophone response in the frequency range where this increased signal loss occurs should-thus afford a means for determining the effective vibrational relaxation time of the gas in the spectrophone cell. An apparatus is described which was used to measure spectrophone signal amplitudes over a range of chopping frequencies from 200 to 1600 cps, at gas pressures from one atmosphere down to a few millimeters. Response curves obtained for methane gas at pressures of one atmosphere and one-half atmosphere exhibit the behavior predicted by the theory, but show no increased signal loss at the higher chopping frequencies. However, the response curves for methane at pressures of 5 mm, 10 mm, and 20 mm do exhibit such a high frequency loss; from these response data a vibrational relaxation time of T= 1.1 microseconds at one atmosphere has been assigned to methane. This value agrees within a factor of two with all similar results reported by other workers. Studies of the spectrophone frequency response obtained for mixtures of methane and carbon dioxide, with carbon dioxide concentrations of one percent and five percent, indicate that the presence of carbon dioxide serves to decrease the vibrational relaxation time in methane. Studies of the spectrophone frequency response obtained for three deuterated methanes, CH3D, CH2D2, and CHD3, yield values of T= 0.87 microseconds for CH3D, T= 0.99 microseconds for CH2D2, and T= 1.45 microseconds for CHD3, all at one atmosphere pressure. The longer time for CHD3 is interpreted in terms of the decreased rotational velocity of the deuterium atoms in this molecule, which reduces the probability of vibrational- rotational energy transfer during molecular collisions.
Unimolecular Kinetics
Author: Publisher: Elsevier
ISBN: 012816218X
Category : Science
Languages : en
Pages : 540
Book Description
Unimolecular Kinetics: Part 2: Collisional Energy Transfer and the Master Equation, Volume 43 in Elsevier’s Comprehensive Molecular Kinetics series, addresses collision energy transfer and the effects it has on gas phase reactions, particularly at low gas density. Such systems include combustion, industrial gas phase processes and atmospheric/environmental processes. The book also discusses The Master Equation to give a good overview of the mechanics underpinning unimolecular kinetics. This new volume will be of interest to researchers investigating gas phase processes which involve unimolecular reactions and the related intermolecular reactions. Discusses collision energy transfer and the effects it has on gas phase reactions Introduces stochastic techniques to energy transfer methods, allowing for an extension of the unimolecular theory beyond simple molecular dissociation Draws an important connection between detailed reaction dynamic studies and the rate of coefficient determination
NBS Special Publication
Author: Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 362
Book Description
Author: 
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