Author: Robert Lawrence McKenziePublisher: 1976.
ISBN:
Category : Collisional excitation
Languages : en
Pages : 252
Book Description
Vibration-translation Energy Transfer in Vibrationally Excited Diatomic Molecules
Author: Robert Lawrence McKenziePublisher: 1976.
ISBN:
Category : Collisional excitation
Languages : en
Pages : 252
Book Description
Vibration-translation Energy Transfer in Anharmonic Diatomic Molecules. 2: The Vibrational Quantum Number Dependence
Author: Vibration-translation Energy Transfer in Anharmonic Diatomic Molecules. 1: A Critical Evaluation of the Semiclassical Approximation
Author: Vibrational Energy Transfer in Selectively Excited Diatomic Molecules
Author: Cameron John DaschVibrational Energy Transfer in Selectively Excited Diatomic Molecules. [Relaxation Rates, Self-relaxation, Upper Limits].
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Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Single rovibrational states of HCl(v=2), HBr(v=2), DCl(v=2), and CO(v=2) were excited with a pulsed optical parametric oscillator (OPO). Total vibrational relaxation rates near - resonance quenchers were measured at 295°K using time resolved infrared fluorescence. These rates are attributed primarily to V - V energy transfer, and they generally conform to a simple energy gap law. A small deviation was found for the CO(v) + DCl(v') relaxation rates. Upper limits for the self relaxation by V - R, T of HCl(v=2) and HBr(v=2) and for the two quantum exchange between HCl and HBr were determined. The HF dimer was detected at 295°K and 30 torr HF pressure with an optoacoustic spectrometer using the OPO. Pulsed and chopped, resonant and non-resonant spectrophones are analyzed in detail. From experiments and first order perturbation theory, these V - V exchange rates appear to behave as a first order perturbation in the vibrational coordinates. The rotational dynamics are known to be complicated however, and the coupled rotational - vibrational dynamics were investigated theoreticaly in infinite order by the Dillon and Stephenson and the first Magnus approximations. Large .delta. J transitions appear to be important, but these calculations differ by orders of magnitude on specific rovibrational transition rates. Integration of the time dependent semiclassical equations by a modified Gordon method and a rotationally distorted wave approximation are discussed as methods which would treat the rotational motion more accurately. 225 references.
Nonequilibrium Vibrational Kinetics
Author: Mario CapitelliPublisher: Springer Science & Business Media
ISBN: 3642486150
Category : Science
Languages : en
Pages : 354
Book Description
This book is devoted to the systematic treatment of nonequi 1 ibrium vibrational kinetics in molecular systems. Particular emphasis is given to the vibrational excitation of diatomic molecules by low-energy electrons in a discharge and by IR photons in laser-pumped systems. The book follows the different steps of the introduction, redistribution, loss, and chemical conversion of the vibrational quanta, from the points of view of the overall kinetics and the dynamics of elementary processes. These two aspects are balanced in a multidisciplinary approach. The different chapters give the basic instruments (theoretical and experimental) which are needed to understand the ki netics of nonequilibrium systems. The book will introduce the reader to different areas such as plasmachemistry, laser chemistry, IR and Raman spectroscopy, and relaxation phenomena, emphasizing how the vibrational energy affects such research fields. The chapters dedicated to collisional dynamics involving vibrational excited molecules provide an introduc tion to the modern techniques uti 1 ized in the scattering theory of inelastic and reactive collisions. The extension of the vibrational kinetics to polyatomic mole cules, discussed in Chap. 10, is the natural bridge between coll ision and coll i sionless regimes. In conclusion, we hope that the approach followed in this book will stimulate the collaboration of researchers coming from different research fields, which are too often completely separate.
Energy Redistribution in Diatomic Molecules on Surfaces
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Translational and internal degrees of freedom of a scattered beam of NO molecules from a Pt(111) single crystal surface were measured as a function of scattering angle and crystal temperature in the range 450 to 1250K. None of the three degrees of freedom were found to fully accommodate to the crystal temperature, the translational degree being the most accommodated and the rotational degree of freedom the least. A precursor state model is suggested to account for the incomplete accommodation of translational and vibrational degrees of freedom as a function of crystal temperature and incident beam energy. The vibrational accommodation is further discussed in terms of a competition between desorption and vibrational excitation processes, thus providing valuable information on the interaction between vibrationally excited molecules and surfaces. Energy transfer into rotational degrees of freedom is qualitatively discussed.
Vibrational and Rotational Relaxation in Gases
Author: James Dewe LambertPublisher: Oxford University Press, USA
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 168
Book Description
Vibrational Energy Transfer in Liquids
Author: Hamzeh Moh'd Abdel-HalimPublisher:
ISBN:
Category : Carbon monoxide lasers
Languages : en
Pages : 328
Book Description
Molecular Vibrational Energy Distributions During Exchange-dominated Relaxation
Author: Charles E. TreanorPublisher:
ISBN:
Category : Gas dynamics
Languages : en
Pages : 46
Book Description