On the Collision Mechanism of Bimolecular Reactions: Theory and experimental method for the determination of the velocity spectrum of products from Simple H-transfer reactions of the type X+H2 [right arrow] XH++H PDF Download
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![On the Collision Mechanism of Bimolecular Reactions: Theory and experimental method for the determination of the velocity spectrum of products from Simple H-transfer reactions of the type X+H2 [right arrow] XH++H PDF](https://books.google.com/books/content/images/frontcover/8M8AeAODZ6kC?fife=w150-h200)
Author: A. Henglein
Publisher:
ISBN:
Category : Bimolecular collisions
Languages : en
Pages : 28
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Book Description
![On the Collision Mechanism of Bimolecular Reactions: Theory and experimental method for the determination of the velocity spectrum of products from Simple H-transfer reactions of the type X+H2 [right arrow] XH++H PDF](https://books.google.com/books/content/images/frontcover/8M8AeAODZ6kC?fife=w80-h100)
Author: A. Henglein
Publisher:
ISBN:
Category : Bimolecular collisions
Languages : en
Pages : 28
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Book Description
Author: A. Henglein
Publisher:
ISBN:
Category : Bimolecular collisions
Languages : en
Pages : 17
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Book Description
A simple apparatus is described which allows one to measure the velocity spectrum of the XH(+) or XD(+) ions, respectively, resulting from ion-molecule reactions of the type X(+) + H2(D2) forming XH(+) + H(XD(+) + D). The secondary ions are not accelerated after their formation. The incident X(+)-ions have kinetic energies between 20 and 200 cV. Furthermore, the velocity spectra are calculated which have to be expected for different collision models. (1) Complex model: All the atoms in the reactants participate in the collision. Every kind of collision between those limiting cases is conceivable, in which the relative kinetic energy of the reactants and the heat of reaction appear as internal energy of the product ion or as kinetic energy of both products (completely inelastic and elastic collision with atomic rearrangement, respectively). (2) Stripping model: The incident X(+)-particle hits only one atom of the hydrogen molecule in a completely inelastic collision without transfer of momentum to the second hydrogen atom. It is also shown that the cross section of the reaction becomes zero above a certain energy of the incident ion. This critical energy depends on the collision mechanism. It can be measured with the apparatus described. In addition an isotope effect of the order of 2 with respect to the critical energy is expected from the transfer of an H or D atom, respectively.
Author: A. Henglein
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Book Description
A simple apparatus is described which allows one to measure the velocity spectrum of the XH(+) or XD(+) ions, respectively, resulting from ion-molecule reactions of the type X(+) + H2(D2) forming XH(+) + H(XD(+) + D). The secondary ions are not accelerated after their formation. The incident X(+)-ions have kinetic energies between 20 and 200 cV. Furthermore, the velocity spectra are calculated which have to be expected for different collision models. (1) Complex model: All the atoms in the reactants participate in the collision. Every kind of collision between those limiting cases is conceivable, in which the relative kinetic energy of the reactants and the heat of reaction appear as internal energy of the product ion or as kinetic energy of both products (completely inelastic and elastic collision with atomic rearrangement, respectively). (2) Stripping model: The incident X(+)-particle hits only one atom of the hydrogen molecule in a completely inelastic collision without transfer of momentum to the second hydrogen atom. It is also shown that the cross section of the reaction becomes zero above a certain energy of the incident ion. This critical energy depends on the collision mechanism. It can be measured with the apparatus described. In addition an isotope effect of the order of 2 with respect to the critical energy is expected from the transfer of an H or D atom, respectively.
![On the Collision Mechanism of Bimolecular Reactions: Investigations of the reaction N2++H2(D2) [right arrow] N2H++H(N2D++D) and CO++H2(D2) [right arrow] COH++H(COD++D) PDF](https://books.google.com/books/content/images/frontcover/y0AfYGlE2M0C?fife=w80-h100)
Author: A. Henglein
Publisher:
ISBN:
Category : Bimolecular collisions
Languages : en
Pages : 20
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Book Description
![On the Collision Mechanism of Bimolecular Reactions: The stripping mechanism of the reactions Ar++H2(D2) [right arrow] ArH++H(ArD++D) at energies> 20 eV PDF](https://books.google.com/books/content/images/frontcover/1JAaIDTYWdsC?fife=w80-h100)
Author: A. Henglein
Publisher:
ISBN:
Category : Bimolecular collisions
Languages : en
Pages : 24
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Book Description
Author: M. N. R. Ashfold
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 444
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Book Description
Designed to provide an authoritative and timely review of advances in the field of gas-phase photochemistry and kinetics, this volume contains a collection of papers on biomolecular collisions. Contributors discuss collision processes, reactive processes and association reactions.
Author: W. Miller
Publisher: Springer Science & Business Media
ISBN: 1475706448
Category : Science
Languages : en
Pages : 391
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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.
Author: K. Lacmann
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 9
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Book Description
Author: K. Lacmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
At moderate kinetic energies up to about 50 eV of the incident ion, the velocity spectra agree with the predictions of the stripping model. At higher energies, the bands of the product ions are shifted to somewhat higher velocities. This indicates preferential forward scattering of the charged reaction product and less conversion of kinetic energy of the incident ion into internal energy of the products. As was expected, the cross sections for the transfer of an H- and D-atom are equal at the same relative kinetic energy. Over a wide range of energy, the cross section depends on the relative kinetic energy as sigma = k1 . c to the ( -k2Es) power. Reactions could still be observed at relative kinetic energies, which are larger than the dissociation energy of the product ion (up to 7 eV for N2H(+) and N2D(+) and up to 10 eV for COH(+) and COD(+)). These details of the collision mechanism are tentatively explained by two hypotheses. (Author).
Author: Luis Arnaut
Publisher: Elsevier
ISBN: 0080469345
Category : Science
Languages : en
Pages : 563
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Book Description
Chemical Kinetics bridges the gap between beginner and specialist with a path that leads the reader from the phenomenological approach to the rates of chemical reactions to the state-of-the-art calculation of the rate constants of the most prevalent reactions: atom transfers, catalysis, proton transfers, substitution reactions, energy transfers and electron transfers. For the beginner provides the basics: the simplest concepts, the fundamental experiments, and the underlying theories. For the specialist shows where sophisticated experimental and theoretical methods combine to offer a panorama of time-dependent molecular phenomena connected by a new rational. Chemical Kinetics goes far beyond the qualitative description: with the guidance of theory, the path becomes a reaction path that can actually be inspected and calculated. But Chemical Kinetics is more about structure and reactivity than numbers and calculations. A great emphasis in the clarity of the concepts is achieved by illustrating all the theories and mechanisms with recent examples, some of them described with sufficient detail and simplicity to be used in general chemistry and lab courses. * Looking at atoms and molecules, and how molecular structures change with time. * Providing practical examples and detailed theoretical calculations* Of special interest to Industrial Chemistry and Biochemistry
