Download or read book Vibrational Deactivation of HF v written by R. F Heidner (III.) and published by . This book was released on 1975 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deactivation of HF(v = 1) and DF(v = 1) by H and D atoms was studied at 295 K by means of the techniques of laser-induced infrared fluoresence and isothermal calorimetry. The upper limits for the deduced rate coefficients are well-defined, but the lower limits are imprecise. The results of this study are compared with other experimental data and with trajectory calculations. Qualitative data are presented regarding the role of reactive, i.e., F-atom exchange, versus nonreactive collisions in the removal of the v = 1 level. A verification of the method was made by determining a rate coefficient for H + HCl(v = 1) that is in good agreement with a recent study.
Download or read book The Vibrational Deactivation of HF v written by Jerry F. Bott and published by . This book was released on 1977 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rate of HF(v = 2 and 3) removal by H atoms was measured at T = 295 K. The measurements were performed by laser-induced fluorescence in a discharge flow tube in which H atoms were produced by a microwave discharge. The absolute H-atom concentrations were measured by isothermal calorimetry with a Pt wire coil as a catalytic probe. A small fraction of the injected HF(v = 0) was pumped first to HF(v = 1) and subsequently to HF(v = 2) and HF(v = 3) by the multiline output from a pulsed HF transverse excitation atmospheric (TEA) laser.
Download or read book Deactivation of Higher Vibrational Levels of HF by F Atoms written by J. F. Bott and published by . This book was released on 1984 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vibrational relaxation times of HF(v = 3) and HF(V = 1) in the presence of F atoms have been measured in a slow-flow fluorescence cell at room temperature. The HF is pumped to vibrational levels v = 1, 2, and 3 by a pulsed HF laser. It was found that F atoms deactivate HF(V = 3) faster than they do HF(v = 1) by a factor of 20.8 + or - 2.0. This dependence of the deactivation rate coefficient on v agrees with that determined for the exothermic V-V or V-R, T deactivation of HF(V = 1 to 3) by N2, O2, D2 and HC1. (Author).
Download or read book Flow Tube Studies of the Deactivation of HF V by Selected Polyatomic Molecules written by Munson A. Kwok and published by . This book was released on 1975 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large-diameter, medium-pressure flow tube has been used to study deactivation processes by selected polyatomic molecules that are potentially relevant in chemical laser systems. Effective vibrational deactivation rate constants for HF(v = 1,2,3) relaxed by H2S, CO2, N2O, CH4, CF4, and SF6 have been determined. The rates for a given chaperone increase with increasing v. The agreement with results for HF(1) + M reported from laser-induced fluorescence experiments is generally very good. The role of HF rotational energy in absorbing a vibrational energy defect is examined. An empirical correlation with adjusted vibrational energy defect is suggested.
Download or read book Vibrational Relaxation of HF v written by Jerry F. Bott and published by . This book was released on 1980 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vibrational relaxation rates of HF(V = 1) and HF(v = 3) have been measured in H2, N2, and D2 at 200 and 295 K. The v dependence of the relaxation rates is essentially the same for N2, D2, and several other diatomic molecules that deactivate HF by exothermic processes. The rates for HF(v = 3) deactivation are larger than those for HF(v = 1) by a factor of about 18 at both 200 and 295 K. (Author).
Download or read book The Deactivation of HF v written by J. F. Bott and published by . This book was released on 1985 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water is often present as an impurity in HF chemical laser systems and can affect laser performance because of the large HF(1) - H2O deactivation rate coefficient. Diatomic molecules have been found to deactivate the higher vibrational levels of HF(v) with rate coefficients that scale with v as v superscript n where n = 2.7 when the deactivation process is exothermic. This scaling does not hold for HF(v) - H2 collisions in which the primary deactivation process is an endothermic V-V transfer with the endothermicity increasing with v. The room temperature (T = 295 K) deactivation rate of HF (v = 3) by H2O has been measured to be faster than the deactivation rate of HF(v = 1) by H2O by a factor of 3.9. On the basis of a previously reported measurement of the HF(v = 1) - H2O rate coefficient, the deactivation rate coefficient of HF(v = 3) by H2O is estimated to be 16 microseconds/Torr, which is a factor of 3 faster than the hard sphere collision rate. The theoretical implication of this fast-rate coefficient are reviewed. Keywords: Chemical kinetics; Vibrational deactivation.
Download or read book Flow Tube Measurements of H HF v Deactivation Rates written by Munson A. Kwok and published by . This book was released on 1975 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: A medium-pressure flow tube is used to determine the rate constants for vibrational deactivation of HF(v = 1, 2, 3) by H-atoms by monitoring the HF vibration-rotation emission. The deactivation of HF(v) by H-atoms is found to be a very efficient energy-transfer process. The experimental results are compared with available theoretical data of Wilkins.
Download or read book Deactivation of HF v written by S. J. Arnold and published by . This book was released on 1977 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A discharge-flow-tube technique has been used to measure the deactivation of HF(v=1,2). Effective vibrational deactivation rate constants for HF(v=1,2) relaxed by C2H4, C2H3F, 1 1C2H2F2, cis 1 2C2H2F2, trans 1 2C2H2F2, C2HF3, and C2F4 have been determined.
Download or read book NBS Special Publication written by and published by . This book was released on 1981 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Gas Kinetics and Energy Transfer written by P G Ashmore and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photoselective Chemistry Volume 47 Part 2 written by Joshua Jortner and published by John Wiley & Sons. This book was released on 2009-09-08 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advances in Chemical Physics series provides the chemical physics and physical chemistry fields with a forum for critical, authoritative evaluations of advances in every area of the discipline. Filled with cutting-edge research reported in a cohesive manner not found elsewhere in the literature, each volume of the Advances in Chemical Physics series serves as the perfect supplement to any advanced graduate class devoted to the study of chemical physics.
Download or read book Vibrationally Excited Hydrogen Halides written by Francis Westley and published by . This book was released on 1974 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vibrational Energy Exchange and Deactivation Processes in the HF DF HR CO and DF CO Systems from 2050K to 6750K written by Roy Alan Lucht and published by . This book was released on 1976 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data Index for Energy Transfer Collisions of Atoms and Molecules 1970 1979 written by and published by . This book was released on 1981 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
