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3 edition of Associative and dissociative ionization of gases on impact of metastable atoms. found in the catalog.

Associative and dissociative ionization of gases on impact of metastable atoms.

  • 218 Want to read
  • 10 Currently reading

Published .
Written in English

    Subjects:
  • Ionization of gases.

  • The Physical Object
    Paginationvi, 53 p.
    Number of Pages53
    ID Numbers
    Open LibraryOL23420731M
    OCLC/WorldCa18066468

    Derbyshire, Joseph Macarthur., "O((1)S) metastable production from electron impact dissociative excitation of water, deuterium oxide and nitric oxide." ().Author: Joseph Macarthur. Derbyshire. a compound containing atoms or ions of two elements. monatomic ion. an ion of a single atom. polyatomic ion. an ion containing two or more atoms. oxoanion. an anion containing oxygen attached to some other element. formula unit. the smallest repeating unit in an ionic compound. molecular formula. •Ionization + dissociation of molecules in linearly polarized laser fields •Ionization rates depend on the orientation and alignment of molecules, they are correlated to the elecron density of HOMO •Long pulses cause post-ionization alignment, which distorts the picture Schematic of the ionization process Observed and calculated angular dis-. associative ionization; Ionization process in which two atoms or molecules, one or both of which is in an excited state, react. to form a single positive ion and an electron. See also dissociative ionization, Penning ionization. From [5,6]. associative ion/molecule reaction; See association reaction. atmospheric pressure ionization (API).


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Associative and dissociative ionization of gases on impact of metastable atoms. by John Austin Herce Download PDF EPUB FB2

Tableofcontents page acknowledgment iii listoftables v listoffigures vi chapter i. introduction 1 ofmetastableatomsand inelasticprocesses 4 iii.

descriptionofapparatus 10 iv. Metastable atoms and molecules play an important role in a variety of situations ranging from electrical discharges to astrophysical phenomena (see, e.g., Borcia et al., ; Khromov, ; Associative and dissociative ionization of gases on impact of metastable atoms.

book et al., Associative and dissociative ionization of gases on impact of metastable atoms. book can influence biological situations as well.

They have been observed to moderate biochemical reactions and may play a role in regenerating nerve tissue (Rochkind and Ouaknine, ). Volume Associative and dissociative ionization of gases on impact of metastable atoms.

book, number 2,3 CHEMICAL PHYSICS LETTERS 3 February DISSOCIATIVE EXCITATION OF SOME METAL HALIDES BY RARE-GAS METASTABLE ATOMS* P. BALTAYAN, J.C. PEBAY-PEYROULA and N. SADEGHI Laboratoire de Speetromdtrie Physique *, Universit~ Scientifique et M~dicale de Grenoble, B.P. 68, Saint-Martin ~l'H~res Cedex, France Received 28 Cited by: 5.

An analysis of the modern theory of associative ionization (AI) is performed, and ways of its further development are discussed. The threshold behavior of the cross section of endothermic AI reactions is considered and it is shown that, in the quantum case, its dependence on the above-threshold energy E is strictly linear, i.e., significantly different from the E 3/2 law ensuing from the Cited by:   The associative-to-Penning ionization cross section ratio is simulated with a classical model for the Ne*(3 P 2,0)-Ar used the semi-classical optical potential curve of Gregor and Siska together with calculated ab initio Ne-Ar + potential curves to describe the entry and exit channels, respectively.

This model which had already been adjusted to fit the total cross section failed. The model is applied to the problems of symmetric associative (and dissociative) ionization and excitation transfer in collisions of excited helium with the ground-state atom, using the diabatic.

A detailed calculation based on a perturbed stationary-state description is presented for associative ionization of hydrogen atoms.

Specific rate constants kAI (v,K,T) are evaluated for the set of. A kinetic scheme for non-equilibrium regimes of atmospheric pressure air discharges is developed. A distinctive feature of this model is that it includes associative ionization with the participation of Associative and dissociative ionization of gases on impact of metastable atoms.

book, 2P) atoms. The thermal dissociation of vibrationally excited nitrogen molecules and the electronic excitation from all the vibrational levels of the nitrogen molecules are also accounted : Ezequiel Cejas, Beatriz Rosa Mancinelli, Leandro Prevosto.

The exothermic reactions He*+H→HeH++e and He*+D→HeD++e have been studied by merging‐beams techniques over a range of interaction energy W from –10 eV. The He* represents a composite of He(2 1S) and He(2 3S). Data were obtained by observing currents due to the product ions. For each process the relative effective cross section QR (i.e., for the composite He*) as a function of Cited by:   The endothermic associative ionization reaction N(2 D) + O(3 P) → NO** → NO(1Σ+) +e- in slow collisions of the atoms has been considered in terms of the multichannel quantum defect theory.

The dependences of the partial and total cross sections of the reaction on the energy of the colliding atoms in the range of 0– eV have been by: 2. The Space Research Coordination Center, established in May,has the following functions: (1) it ad- ministers predoctoral and postdoctoral fellowships in space-related science and engineering programs; (2) it makes available, on a p p 1 i c a t i on and after review, allocations to assist new faculty members in the Division of the N a tu r a1 Sciences and the School of Engineering to.

The dissociative excitation of HgBr2 by rare‐gas metastable atoms and N2(A3J+u) has been studied in a flowing afterglow apparatus. Reaction of HgBr2 with the lighter rare gas (He, Ne, and Ar) metastable atoms gave strong Hg* line emissions.

Intense HgBr (B2J+→X2J+) emission (– nm) from Xe(3P2) and N2(A) reactions was observed. The rate constants for HgBr* (B) formation from HgBr2 Cited by: The numerical treatment of atoms or molecules in strong laser pulses is very demand-ing.

An exact non-relativistic quantum-mechanical calculation would require the solution of the many-body Schrodinger¨ equation for all nuclei and electrons.

So far, this has been achieved only for atoms, and only for atoms with one electron [17, 18] or two. This is also similar to electron-impact ionization but is simply neutral-impact ionization. The average kinetic energy of a gas particle can be approximated by.

From an order-of-magnitude analysis, the temperature of the gas needs to be, K for a neutral to have kinetic energy that approaches that of the ionization energy. So it is clear that. Dissociative recombination studies of other molecular ions in the interstellar medium and in cometary and planetary atmospheres are covered.

Ionization is an important competitive process to dissociative recombination and its competition with predissociation and its role in the reverse process of the association of neutral species is : Paperback.

technique [1], we report the dissociative single, double and triple ionization kinematics of N 2 mole-cules impact byand eV electrons, covering another electron-impact energy range. The KER spectra of different ions or channels resulting from N 2 impact byand eV electrons respectively are shown in Figure 1.

The. Mass spectrometric investigation of dissociative ionization of toxic gases by electrons at eV. Adamczyk B(1), Bederski K, Wójcik L. Author information: (1)Institute of Physics M. Curie-Sklodowska University, Lublin, by: @article{osti_, title = {Studies of the electron-impact ionization cross section of vibrationally excited oxygen employing a shock-heated molecular beam}, author = {Evans, B.

and Chang, J.S. and Yau, A.W. and Nicholls, R.W. and Hobson, R.M.}, abstractNote = {The shock-heated molecular-beam technique was used to obtain vibrationally excited oxygen molecules.

Lafosse, A. et al. Molecular frame photoelectron angular distributions in dissociative photoionization of H 2 in the region of the Q 1 and Q 2 doubly excited states. Phys. excited states. Hence, stepwise ionization proceeds through the lowest excitation states.

The concentration of excited atoms and the rate of atom stepwise ionization in a gas discharge plasma of inert gases are evaluated. It is shown that many regimes of equilibrium in this plasma may be realized depending on its parameters that makes an universal. A new spectrometer for the study of metastable states of atoms and molecules by high-resolution photoionization spectroscopy, pulsed-field-ionization zero-kinetic-energy (PFI-ZEKE) photoelectron spectroscopy, and mass spectrometry has been designed, built and tested.

The apparatus consists of 1) a versatile pulsed laser system that enables in. A model of a stationary glow-type discharge in atmospheric-pressure air operated in high-gas-temperature regimes ( K. metastable while the 1S4and 1S2levels are radiatively coupled to the ground state but are radiation trapped.

Under some discharge conditions, these energy levels can serve as a reservoir of species that have enough energy (= eV)to contribute in principle to ionization, excitation or Cited by: TABLE OF CONTENTS CHAPTER PAGE I.

Introduction 1 II. History of Dissociative Recombination (DR) process 4 III. Theory Formation of the helium molecular ion 6 The curve crossing model for DR reaction 8 Rotation and vibration of diatomic molecules 11 Final atomic product states identification 18 Multichannel Quantum Defect Thery (MCQDT) description of DR 20Author: Luminita Coman.

Methods are described, which are based on the use of a commercial mass spectrometer, for determination of ionization and fragment ion appearance potentials by electron impact. These methods are applied to the principal sulfur-bearing compounds produced by Author: Ken L.

Stricklett, J. Kassoff, James K. Olthoff, Richard J. Van Brunt. On the ionization and dissociative photoionization of iodomethane: molecule into its gas phase atoms, the experimental approach is more limited and must use a variety of anchors.

For example, the equilibrium constant of a neutral reaction is ionization rates in. Joint electron-ion energy spectra for the dissociative ionization of a model H$_2^+$ in few-cycle, infrared laser pulses are calculated via the numerical ab initio solution of the time-dependent Schr\"odinger equation.

A strong, pulse-dependent modulation of the ionization probability for certain values of the protons' kinetic energy (but.

Cambridge Core - Atomic Physics, Molecular Physics and Chemical Physics - Dissociative Recombination of Molecular Ions - by Mats LarssonCited by: In a kinematically complete experiment on the dissociative double ionization of CO2 by electron impact, spontaneous and metastable decay have been observed via the channel CO2 2+ f CO+ + O+.

The metastable decay shows a lifetime of ( ís. The measured kinetic energy release spectrum of the dissociation shows one broad peak. The goals of atomic, molecular, and optical physics (AMO physics) are to elucidate the fundamental laws of physics, to understand the structure of matter and how matter evolves at the atomic and molecular levels, to understand light in all its manifestations, and to create new techniques and devices.

detail in this description of dissociative chemisorption on () Wand Ni surfaces. The first feature is charge transfer between adsorbate and substrate. Charge transfer is a result of the relative positions of,empty and filled molecular orbital energy levels for the sepa­ rated diatomic adsorbates and.

Appendix C, the United States is a world leader in this identify scientific forefronts, technological opportunities, and windows of future opportunity, broad input was sought from the AMO science community through letters to individual scientists, open sessions at.

Dissociative reaction, d: This is identified from a rate constant which is independent of the entering group. Examples include the substitution of a water molecule by another ligand in a hydrated metal ion (see below). Dissociative and associative mechanism can be compared with the S N 1 and S N 2 mechanisms in organic chemistry, but they refer only to the intimate process.

Start studying Earth and Space Chapter Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. All are gases. In each period of the periodic table, metallic activity. Decreases to the right. When they combine chemically with metal atoms, nonmetal atoms tend to.

The best evidence for the Penning ionization mechanism arises from laser depopulation studies in which lower ion signals were observed for species with ioni zation energ1 les than the metastable level of argon at 72 e V while those with higher nerg were unaffected. 4 5 The same result was observed for a neon discharge except that the p ec.

x unit X-radiation X-ray escape peak X-ray fluorescence X-ray fluorescence analysis X-ray intensity X-ray level X-ray photoelectron spectroscopy X-ray satellite X-ray spectroscopy xanthates xanthene dyes xanthic acids xanthophylls xenobiotic xenobiotics xenon lamp xerogel XPS xylylenes ξ- (xi-) YAG Yang photocyclization yard year yield Y in.

Multielectron effects in strong-field dissociative ionization of molecules X. Gong,1 M. Kunitski, 2K. Betsch,3, to those used to study strong-field dissociative ionization of I 2 [15], final ionization event occurs at ever-larger internuclear separation.

Dissociative Ionization / Dissociative Recombination / Example of Hydrogen / Dissociative Electron Attachment / Polar Dissociation / Metastable Negative Ions / Electron Impact Detachment / Vibrational and Rotational Excitations / Elastic Scattering / File Size: KB.

Atomic Collision an elementary collision event between two atomic particles, which may be atoms, molecules, electrons, or ions. Such a collision is either elastic or inelastic.

In an elastic collision, the total kinetic energy of the colliding particles remains the same as before the collision: the kinetic energy is merely redistributed between the. Figure 1. (a) Two gases, H 2 and O 2, are initially separated.(b) When the stopcock is opened, they mix together.

The lighter gas, H 2, passes through the opening faster than O 2, so just after the stopcock is opened, more H2 molecules move to the O 2 side than O 2 molecules move to the H 2 side.

(c) After a short time, both the slower-moving O 2 molecules and the faster-moving H 2 molecules. The Ionization Lifetime of Carbon pdf the Dissociative Lifetime of CO as Determined by GALEX FUV Observations of Comet C/ Q2 (Machholz) Author: Jeff .DISSOCIATION ENERGIES OF METAL-CARBON BONDS AND THE EXCITATION ENERGIES OF METAL ATOMS IN COMBINATION L.

H. LONG University download pdf Exeter, U.K. Volatile methyl compounds are formed by the majority of elements standing up to six places before a rare gas, so that as a class they represent all groups and periods of the Periodic System with the.Dissociative ionization of H ebook by eV circularly polarized photons 4 The radial function χ 00(R) is the lowest ebook state solution of the equation 1 2µ ∂2 ∂R2 +U H2(R)−E 00 χ 00(R) = 0, (5) where µ = mp/2 is the reduced proton mass, U H2(R) is the effective internuclear potential for H 2 in its ground electronic state.

The final dissociative molecular state, corresponding to.