Vibrational Energy Transfer in Selectively Excited Diatomic Molecules. [Relaxation Rates, Self-relaxation, Upper Limits]. PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Vibrational Energy Transfer in Selectively Excited Diatomic Molecules. [Relaxation Rates, Self-relaxation, Upper Limits]. PDF full book. Access full book title Vibrational Energy Transfer in Selectively Excited Diatomic Molecules. [Relaxation Rates, Self-relaxation, Upper Limits]. by . Download full books in PDF and EPUB format.
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.
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.
Author: F. F. Crim Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
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: Mario Capitelli Publisher: 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.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 750
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: F. Fleming Crim Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
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).
![Vibrational Energy Transfer in Selectively Excited Diatomic Molecules. [Relaxation Rates, Self-relaxation, Upper Limits]. PDF](https://books.google.com/books/content/images/frontcover/qfm3AQAACAAJ?fife=w150-h200)
Author: ![Vibrational Energy Transfer in Selectively Excited Diatomic Molecules. [Relaxation Rates, Self-relaxation, Upper Limits]. PDF](https://books.google.com/books/content/images/frontcover/qfm3AQAACAAJ?fife=w80-h100)
Author: 
Author: Cameron John Dasch
Author: 
Author: 
Author: F. F. Crim
Author: Mario Capitelli
Author: 
Author: James Dewe Lambert
Author: F. Fleming Crim
Author: Charles E. Treanor