Molecular Beam Studies of Infrared Multiphoton Dissociation and Inelastic Gas-surface Scattering PDF Download
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Author: Cindy Linea Berrie
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
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Author: Cindy Linea Berrie
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
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Author: Raphael D. Levine
Publisher: Oxford University Press, USA
ISBN:
Category : Science
Languages : en
Pages : 560
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Book Description
This is a textbook for advanced undergraduate and graduate courses on kinetics or chemical physics. It deals with the molecular-level mechanism of elementary chemical reactions.
![Dynamics of Infrared Multiphoton Dissociation of SF6 by Molecular Beam Method. [Nonrandomize Excitation Energy]. PDF](https://books.google.com/books/content/images/frontcover/vEk4nQAACAAJ?fife=w80-h100)
Author:
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Category :
Languages : en
Pages :
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The decomposition of polyatomic molecules by infrared multiphoton absorption is a subject which is under extensive investigation in many laboratories. The process has been shown to be efficient, selective and collisionless. The physical principles which are mainly responsible for the absorption of a large number of photons by an isolated molecule under intense infrared laser radiation have been elucidated through many experimental and theoretical investigations. However, one very important question which remains to be answered is the relation between the dynamics of molecular decomposition and the degree of vibrational excitation, i.e., the question of whether the excitation energy is completely randomized before molecular decomposition. The production of electronically excited fragments in the dissociation of halogenated hydrocarbons and the observations of SF4 fragment in the decomposition of SF6 without the evidence of the formation of lower energy SF5 fragment provided some basis of speculation that the excitation energy might not be randomized before the dissociation of excited molecules. A crossed molecular beam apparatus has been adapted to study the dynamics of excitation and dissociation of polyatomic molecules in intense IR laser fields. Initial experiments have involved the study of the dissociation of SF6 by CO2 laser radiation at 10.6 .mu.m. a molecular beam of SF6 was formed by supersonic expansion using three stages of differential pumping. A grating tuned pulsed CO2 TEA laser was used as the excitation source. The laser beam was focused by a 25 cm focal length ZnSe lens, and crossed the molecular beam near its focal point. The fragments produced by multiphoton dissociation of SF6 within the small interaction region were detected as a function of recoil angle and velocity.
Author: A. M. Wodtke
Publisher:
ISBN:
Category :
Languages : en
Pages : 61
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Infrared multiphoton dissociation in a molecular beam has been studied in order to elucidate the collision free, 'thermal' chemistry and dynamics of nitromethane, nitroethane and 2-nitropropane. The isomerization of CH3NO2 to CH3ONO was observed by detecting the CH3O and NO products from the dissociation of the very internally hot, isomerized nitromethane. A novel application of RRKM theory was used to estimate the barrier height to isomerization at 55.5 kcal/mol. The barrier height determination method was tested and found to give excellent results by applying it to the determintaion of the barrier height to HONO elimination from nitroethane, a value which is well known from activation energy measurements. The method was then applied to the case of HONO elimination from 2-nitropropane and it appears that there is good to believe that the barrier height is 3-5 kcal/mol lower in 2-nitropropane than in nitroethane. The success of this method for determining barrier heights shows how a 'microscopic' molecular beam experiment, using infrared multiphoton dissociation where the concept of temperature has no place, can be quantitatively related to pyrolysis experiments which are conducted under collisional, thermal conditions and measure phenomenological quantities such as activation energies. The concerted HONO elimination reactions from nitroethane and 2-nitropropane were found to channel about 70 and 65 percent of the exist barrier into translation, respectively.
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Category : Dissertations, Academic
Languages : en
Pages : 846
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
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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: National Institute of Standards and Technology (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Author: A. M. Wodtke
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
Infrared multiphoton dissociation in a molecular beam has been studied in order to elucidate the collision-free thermal chemistry and dynamics of nitromethane, nitroethane, and 2-nitropropane. The isomerization of CH3NO2 to CH3ONO was observed by detecting the CH3O and NO products from the dissociation of the internally very hot, isomerized nitromethane. A novel application of RRKM theory was used to estimate the barrier height to isomerization at 55.5 kcal/mol. The barrier height determination method was tested and found to give excellent results by applying it to the determination of the barrier height to HONO elimination from nitroethane, a value which is well-known from activation energy measurements. The method was then applied to the case of HONO elimination from 2-nitropropane and it appears that there is good reason to believe that the barrier height is 3-5 kcal/mol lower in 2-nitropropane than in nitroethane. The success of this method for determining barrier heights shows how a microscopic molecular beam experiment, using infrared multiphoton dissociation where the concept of temperature has no place, can be quantitatively related to pyrolysis experiments which are conducted under collisional, thermal conditions and measure phenomenological quantities such as activation energies. The concerted HONO elimination reactions from nitroethane and 2-nitropropane were found to channel about 70 and 65% of the exit barrier into translation, respectively. This large release of translational energy is suggested to be due to the nature of the transition-state mechanical barrier which is largely made up of repulsive energy between the closed shell products and not of reactant strain energy.
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 456
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Author:
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ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 696
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