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Benito-Gómez I, Méndez L, Suárez J, Gorfinkiel JD, Rabadán I. Resonant Fragmentation of the Water Cation by Electron Impact: a Wave-Packet Study. Chemphyschem 2023; 24:e202300305. [PMID: 37463249 DOI: 10.1002/cphc.202300305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/12/2023] [Accepted: 07/13/2023] [Indexed: 07/20/2023]
Abstract
We have investigated the dissociation of a resonant state that can be formed in low energy electron scattering from H2 O+ . We have chosen the second triplet resonance above theB ˜ 2 A ' ${{{\tilde{\rm {B}}}}\;^2 {\rm{A{^\prime}}}}$ ( B ˜ 2 B 2 ) ${{\rm{(\tilde{B}}}\;^2 {\rm{B}}_2 )}$ state of H2 O+ whose autoionization mainly produces H2 O+ (X ˜ 2 A ' ' ${{{\tilde{\rm {X}}}}\;^2 {\rm{A{^\prime}{^\prime}}}}$ ). We have considered both dissociation of the resonant state itself, dissociative recombination (DR), or the dissociation of the H2 O+ cation after autodetachment, dissociative excitation (DE). The time-evolution of a wave packet on the potential energy surfaces of the resonance and cationic states shows, for the initial conditions studied, that the probability for DR is about 38 % while the probability for DE is negligible.
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Affiliation(s)
- Ignacio Benito-Gómez
- Laboratorio Asociado al CIEMAT de Física Atómica y Molecular en Plasmas de Fusión, Departamento de Química, módulo 13, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Luis Méndez
- Laboratorio Asociado al CIEMAT de Física Atómica y Molecular en Plasmas de Fusión, Departamento de Química, módulo 13, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Jaime Suárez
- Laboratorio Asociado al CIEMAT de Física Atómica y Molecular en Plasmas de Fusión, Departamento de Química, módulo 13, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Jimena D Gorfinkiel
- School of Physical Sciences, The Open University, Walton Hall, MK7 6AA, Milton Keynes, UK
| | - Ismanuel Rabadán
- Laboratorio Asociado al CIEMAT de Física Atómica y Molecular en Plasmas de Fusión, Departamento de Química, módulo 13, Universidad Autónoma de Madrid, 28049, Madrid, Spain
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Gerin M, de Luca M, Lis DC, Kramer C, Navarro S, Neufeld D, Indriolo N, Godard B, Le Petit F, Peng R, Phillips TG, Roueff E. Determination of the Ortho to Para Ratio of H2Cl+ and H2O+ from Submillimeter Observations. J Phys Chem A 2013; 117:10018-26. [DOI: 10.1021/jp4004533] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maryvonne Gerin
- LERMA, Observatoire de Paris, ENS, and UMR8112 du CNRS, 24 rue Lhomond,
Paris 75231 cedex 05, France
| | - Massimo de Luca
- LERMA, Observatoire de Paris, ENS, and UMR8112 du CNRS, 24 rue Lhomond,
Paris 75231 cedex 05, France
| | - Dariusz C. Lis
- MC301-17, Cahill Center for
Astronomy and Astrophysics, CalTech, Pasadena,
California 91125, United States
| | - Carsten Kramer
- IRAM, Instituto de RadioAstronomìa Milimétrica, Avenida Divina
Pastora, 7, Núcleo CentralE 18012 Granada, Spain
| | - Santiago Navarro
- IRAM, Instituto de RadioAstronomìa Milimétrica, Avenida Divina
Pastora, 7, Núcleo CentralE 18012 Granada, Spain
| | - David Neufeld
- Department of Physics
and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Nick Indriolo
- Department of Physics
and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Benjamin Godard
- LUTH, Observatoire de Paris and UMR8102 du CNRS, Place J. Janssen, 92190
Meudon, France
| | - Franck Le Petit
- LUTH, Observatoire de Paris and UMR8102 du CNRS, Place J. Janssen, 92190
Meudon, France
| | - Ruisheng Peng
- MC301-17, Cahill Center for
Astronomy and Astrophysics, CalTech, Pasadena,
California 91125, United States
| | - Thomas G. Phillips
- MC301-17, Cahill Center for
Astronomy and Astrophysics, CalTech, Pasadena,
California 91125, United States
| | - Evelyne Roueff
- LUTH, Observatoire de Paris and UMR8102 du CNRS, Place J. Janssen, 92190
Meudon, France
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Adamson SO, Buenker RJ, Golubkov GV, Golubkov MG, Dement’ev AI. Laser stimulation of low-temperature dissociative recombination of electrons and oxygen molecular ions. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2009. [DOI: 10.1134/s1990793109020055] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Thomas RD. When electrons meet molecular ions and what happens next: dissociative recombination from interstellar molecular clouds to internal combustion engines. MASS SPECTROMETRY REVIEWS 2008; 27:485-530. [PMID: 18618616 DOI: 10.1002/mas.20169] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The interaction of matter with its environment is the driving force behind the evolution of 99% of the observed matter in the universe. The majority of the visible universe exists in a state of weak ionization, the so called fourth state of matter: plasma. Plasmas are ubiquitous, from those occurring naturally; interstellar molecular clouds, cometary comae, circumstellar shells, to those which are anthropic in origin; flames, combustion engines and fusion reactors. The evolution of these plasmas is driven by the interaction of the plasma constituents, the ions, and the electrons. One of the most important subsets of these reactions is electron-molecular ion recombination. This process is significant for two very important reasons. It is an ionization reducing reaction, removing two ionised species and producing neutral products. Furthermore, these products may themselves be reactive radical species which can then further drive the evolution of the plasma. The rate at which the electron reacts with the ion depends on many parameters, for examples the collision energy, the internal energy of the ion, and the structure of the ion itself. Measuring these properties together with the manner in which the system breaks up is therefore critical if the evolution of the environment is to be understood at all. Several techniques have been developed to study just such reactions to obtain the necessary information on the parameters. In this paper the focus will be on one the most recently developed of these, the Ion Storage Ring, together with the detection tools and techniques used to extract the necessary information from the reaction.
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Affiliation(s)
- Richard D Thomas
- Department of Physics, Albanova University Centre, Stockholm University, S106 91 Stockholm, Sweden.
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Petrignani A, Andersson PU, Pettersson JBC, Thomas RD, Hellberg F, Ehlerding A, Larsson M, van der Zande WJ. Dissociative recombination of the weakly bound NO-dimer cation: cross sections and three-body dynamics. J Chem Phys 2005; 123:194306. [PMID: 16321087 DOI: 10.1063/1.2116927] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Dissociative recombination (DR) of the dimer ion (NO)(2) (+) has been studied at the heavy-ion storage ring CRYRING at the Manne Siegbahn Laboratory, Stockholm. The experiments were aimed at determining details on the strongly enhanced thermal rate coefficient for the dimer, interpreting the dissociation dynamics of the dimer ion, and studying the degree of similarity to the behavior in the monomer. The DR rate reveals that the very large efficiency of the dimer rate with respect to the monomer is limited to electron energies below 0.2 eV. The fragmentation products reveal that the breakup into the three-body channel NO+O+N dominates with a probability of 0.69+/-0.02. The second most important channel yields NO+NO fragments with a probability of 0.23+/-0.03. Furthermore, the dominant three-body breakup yields electronic and vibrational ground-state products, NO(upsilon=0)+N((4)S)+O((3)P), in about 45% of the cases. The internal product-state distribution of the NO fragment shows a similarity with the product-state distribution as predicted by the Franck-Condon overlap between a NO moiety of the dimer ion and a free NO. The dissociation dynamics seem to be independent of the NO internal energy. Finally, the dissociation dynamics reveal a correlation between the kinetic energy of the NO fragment and the degree of conservation of linear momentum between the O and N product atoms. The observations support a mechanism in which the recoil takes place along one of the NO bonds in the dimer.
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Affiliation(s)
- Annemieke Petrignani
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
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Petrignani A, Hellberg F, Thomas RD, Larsson M, Cosby PC, van der Zande WJ. Electron energy-dependent product state distributions in the dissociative recombination of O2+. J Chem Phys 2005; 122:234311. [PMID: 16008445 DOI: 10.1063/1.1937388] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present product state distributions and quantum yields from the dissociative recombination reaction of O2+ in its electronic and vibrational ground states as a function of electron collision energy between 0 and 300 meV. The experiments have been performed in the heavy-ion storage ring, CRYRING, and use a cold hollow-cathode discharge source for the production of cold molecular oxygen ions. The branching fractions over the different dissociation limits show distinct oscillations while the resulting product quantum yields are largely independent of electron collision energy above 40 meV. The branching results are well reproduced assuming an isotropic dissociation process, in contrast with recent theoretical predictions.
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Affiliation(s)
- Annemieke Petrignani
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands.
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Hellberg F, Zhaunerchyk V, Ehlerding A, Geppert WD, Larsson M, Thomas RD, Bannister ME, Bahati E, Vane CR, Osterdahl F, Hlavenka P, af Ugglas M. Investigating the breakup dynamics of dihydrogen sulfide ions recombining with electrons. J Chem Phys 2005; 122:224314. [PMID: 15974675 DOI: 10.1063/1.1930830] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
This paper presents results concerning measurements of the dissociative recombination (DR) of dihydrogen sulfide ions. In combination with the ion storage ring CRYRING an imaging technique was used to investigate the breakup dynamics of the three-body channel in the DR of 32SD2(+). The two energetically available product channels S(3P) + 2D(2S) and S(1D) + 2D(2S) were both populated, with a branching fraction of the ground-state channel of 0.6(0.1). Information about the angle between the two deuterium atoms upon dissociation was obtained together with information about how the available kinetic energy was distributed between the two light fragments. The recombination cross sections as functions of energy in the interval of 1 meV to 0.3 eV in the center-of-mass frame are presented for 34SH2(+). The thermal rate coefficient for the DR of 34SH2(+) was determined to be (4.8+/-1.0) x 10(-7)(T/300)(-0.72+/-0.1) cm3 s(-1) over this interval.
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Affiliation(s)
- Fredrik Hellberg
- Department of Physics, Stockholm University, AlbaNova, S-106 91, Stockholm Sweden.
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Petrignani A, van der Zande WJ, Cosby PC, Hellberg F, Thomas RD, Larsson M. Vibrationally resolved rate coefficients and branching fractions in the dissociative recombination of O2+. J Chem Phys 2005; 122:14302. [PMID: 15638654 DOI: 10.1063/1.1825991] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have studied the dissociative recombination of the first three vibrational levels of O(2) (+) in its electronic ground X (2)Pi(g) state. Absolute rate coefficients, cross sections, quantum yields and branching fractions have been determined in a merged-beam experiment in the heavy-ion storage ring, CRYRING, employing fragment imaging for the reaction dynamics. We present the absolute total rate coefficients as function of collision energies up to 0.4 eV for five different vibrational populations of the ion beam, as well as the partial (vibrationally resolved) rate coefficients and the branching fractions near 0 eV collision energy for the vibrational levels v=0, 1, and 2. The vibrational populations used were produced in a modified electron impact ion source, which has been calibrated using Cs-O(2)(+) dissociative charge transfer reactions. The measurements indicate that at low collision energies, the total rate coefficient is weakly dependent on the vibrational excitation. The calculated thermal rate coefficient at 300 K decreases upon vibrational excitation. The partial rate coefficients as well as the partial branching fractions are found to be strongly dependent on the vibrational level. The partial rate coefficient is the fastest for v=0 and goes down by a factor of two or more for v=1 and 2. The O((1)S) quantum yield, linked to the green airglow, increases strongly upon increasing vibrational level. The effects of the dissociative recombination reactions and super elastic collisions on the vibrational populations are discussed.
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Affiliation(s)
- Annemieke Petrignani
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
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Hoops AA, Gascooke JR, Faulhaber AE, Kautzman KE, Neumark DM. Fast beam studies of I2− and I2−·Ar photodissociation. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00708-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Affiliation(s)
- S L Guberman
- Institute for Scientific Research, Lexington, MA 02420, USA.
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Merged-beams studies of electron-molecular ion interactions in ion storage rings. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1071-9687(01)80008-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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