1
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Diabatic potential energy curves for the $$^4{\Pi} $$ states of SH. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02746-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractWe present a diabatic representation of the potential energy curves (PECs) for the $$^4{{\Pi}} $$
4
Π
states of $$\mathrm {SH}$$
SH
. Multireference, configuration interaction (MRCI) calculations were used to determine high-accuracy adiabatic PECs of both $$\mathrm {SH}$$
SH
and $${\mathrm {SH}}^+$$
SH
+
from which the diabatic representation is constructed for $$\mathrm {SH}$$
SH
. The adiabatic PECs exhibit many avoided crossings due to strong Rydberg-valence mixing. We employ the block diagonalization method, an orthonormal rotation of the adiabatic Hamiltonian, to disentangle the valence autoionizing and Rydberg $$^4\Pi $$
4
Π
states of $$\mathrm {SH}$$
SH
by constructing a diabatic Hamiltonian. The diagonal elements of the diabatic Hamiltonian matrix at each nuclear geometry render the diabatic PECs and the off-diagonal elements are related to the state-to-state coupling. Care is taken to assure smooth variation and consistency of chemically significant molecular orbitals across the entire geometry domain.
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2
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Lucchese RR, Rescigno TN, McCurdy CW. The Connection between Resonances and Bound States in the Presence of a Coulomb Potential. J Phys Chem A 2019; 123:82-95. [PMID: 30511875 DOI: 10.1021/acs.jpca.8b10715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The connection between resonant metastable states and bound states with changing potential strength in the presence of a Coulomb potential is fundamentally different from the case of short-range potentials. This phenomenon is central to the physics of dissociative recombination of electrons with molecular cations. Here, it is verified computationally that there is no direct connection between the resonance pole of the S-matrix and any pole in the bound state spectrum. A detailed analysis is presented of the analytic structure of the scattering matrix, in which the resonance pole remains distinct in the complex k-plane while a new state appears in the bound state spectrum. A formulation of quantum-defect theory is developed based on the scattering matrix, which nonetheless exposes a close analytic relation between the resonant and bound state poles and thereby reveals the connection between quantum-defect theory and analytic S-matrix theory in the complex energy and momentum planes. One-channel and multichannel versions of the expressions with numerical examples for simple models are given, and the formalism is applied to give a unified picture of ab initio electronic structure and scattering calculations for e-O2+ and e-H2+ scattering.
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Affiliation(s)
- R R Lucchese
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - T N Rescigno
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - C W McCurdy
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,Department of Chemistry , University of California , Davis , California 95616 , United States
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3
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Kashinski DO, Talbi D, Hickman AP, Di Nallo OE, Colboc F, Chakrabarti K, Schneider IF, Mezei JZ. A theoretical study of the dissociative recombination of SH + with electrons through the 2Π states of SH. J Chem Phys 2017; 146:204109. [PMID: 28571387 PMCID: PMC5449277 DOI: 10.1063/1.4983690] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/05/2017] [Indexed: 11/15/2022] Open
Abstract
A quantitative theoretical study of the dissociative recombination of SH+ with electrons has been carried out. Multireference, configuration interaction calculations were used to determine accurate potential energy curves for SH+ and SH. The block diagonalization method was used to disentangle strongly interacting SH valence and Rydberg states and to construct a diabatic Hamiltonian whose diagonal matrix elements provide the diabatic potential energy curves. The off-diagonal elements are related to the electronic valence-Rydberg couplings. Cross sections and rate coefficients for the dissociative recombination reaction were calculated with a stepwise version of the multichannel quantum defect theory, using the molecular data provided by the block diagonalization method. The calculated rates are compared with the most recent measurements performed on the ion Test Storage Ring (TSR) in Heidelberg, Germany.
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Affiliation(s)
- D O Kashinski
- Department of Physics and Nuclear Engineering, United States Military Academy, West Point, New York 10996, USA
| | - D Talbi
- Laboratoire Univers et Particules de Montpellier, Université de Montpellier, CNRS, Place Eugène Bataillon, 34095 Montpellier, France
| | - A P Hickman
- Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA
| | - O E Di Nallo
- Department of Physics and Nuclear Engineering, United States Military Academy, West Point, New York 10996, USA
| | - F Colboc
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
| | - K Chakrabarti
- Department of Mathematics, Scottish Church College, 1 and 3 Urquhart Square, Calcutta 700 006, India
| | - I F Schneider
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
| | - J Zs Mezei
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
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4
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Takagi H. Cross Sections of the Processes Induced by Electron Collisions with H2+, HeH+, and Their Isotopes. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst13-a16449] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hidekazu Takagi
- Kitasato University, Center for Natural Science, 1-15-1 Kitasato, Mimaniku, Sagamihara, Kanagawa 252-0373, Japan
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5
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White AF, Head-Gordon M, McCurdy CW. Stabilizing potentials in bound state analytic continuation methods for electronic resonances in polyatomic molecules. J Chem Phys 2017; 146:044112. [DOI: 10.1063/1.4974761] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Alec F. White
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Martin Head-Gordon
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - C. William McCurdy
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Chemistry, University of California, Davis, California 95616, USA
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6
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Guberman SL. Some remarks on the selection of exit channels in the theoretical description of dissociative recombination. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158402001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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7
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Guberman SL. The vibrational dependence of dissociative recombination: rate constants for N2 (+). J Chem Phys 2014; 141:204307. [PMID: 25429942 DOI: 10.1063/1.4901892] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Dissociative recombination rate constants are reported with electron temperature dependent uncertainties for the lowest 5 vibrational levels of the N2 (+) ground state. The rate constants are determined from ab initio calculations of potential curves, electronic widths, quantum defects, and cross sections. At 100 K electron temperature, the rate constants overlap with the exception of the third vibrational level. At and above 300 K, the rate constants for excited vibrational levels are significantly smaller than that for the ground level. It is shown that any experimentally determined total rate constant at 300 K electron temperature that is smaller than 2.0 × 10(-7) cm(3)/s is likely to be for ions that have a substantially excited vibrational population. Using the vibrational level specific rate constants, the total rate constant is in very good agreement with that for an excited vibrational distribution found in a storage ring experiment. It is also shown that a prior analysis of a laser induced fluorescence experiment is quantitatively flawed due to the need to account for reactions with unknown rate constants. Two prior calculations of the dissociative recombination rate constant are shown to be inconsistent with the cross sections upon which they are based. The rate constants calculated here contribute to the resolution of a 30 year old disagreement between modeled and observed N2 (+) ionospheric densities.
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Affiliation(s)
- Steven L Guberman
- Institute for Scientific Research, 22 Bonad Road, Winchester, Massachusetts 01890, USA
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8
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9
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Guberman SL. The vibrational dependence of dissociative recombination: cross sections for N2+. J Chem Phys 2013; 139:124318. [PMID: 24089778 DOI: 10.1063/1.4821595] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Theoretical ab initio calculations are reported of the cross sections for dissociative recombination of the lowest four excited vibrational levels of N2(+) at electron energies from 0.001 to 1.0 eV. Rydberg vibrational levels contributing to the cross section structures are identified as are dissociative channels contributing more than 10(-16) cm(2) to the total cross sections. In contrast to the prior study of v = 0 (S. L. Guberman, J. Chem. Phys. 137, 074309 (2012)), which showed 2(3)Πu to be the dominant dissociative channel, 4(3)Πu is dominant for v = 1. Both 2 and 4(3)Πu are major routes for dissociative recombination from v = 2-4. Other routes including 2(3)Σu(+), 3(3)Πu, 2(1)Πu, 2(3)Πg, 2(1)Σg(+), 1(1)Δg, and b('1)Σu(+) are significant in narrow energy ranges. The results show that minor dissociative routes, included here for N2(+), must be included in theoretical studies of other molecular ions (including the simplest ions H2(+) and H3(+)) if cross section agreement is to be found with future high resolution dissociative recombination experiments. The calculated predissociation lifetimes of the Rydberg resonances are used in a detailed comparison to two prior storage ring experiments in order to determine if the prior assumption of isotropic atomic angular distributions at "zero" electron energy is justified. The prior experimental assumption of comparable cross sections for v = 0-3 is shown to be the case at "zero" but not at nonzero electron energies. Circumstances are identified in which indirect recombination may be visualized as a firefly effect.
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Affiliation(s)
- Steven L Guberman
- Institute for Scientific Research, 22 Bonad Road, Winchester, Massachusetts 01890, USA
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10
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Guberman SL. Spectroscopy above the ionization threshold: Dissociative recombination of the ground vibrational level of N2+. J Chem Phys 2012; 137:074309. [DOI: 10.1063/1.4739472] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Stroe M, Fifirig M. Dissociation of vibrationally excited by electrons. Mol Phys 2011. [DOI: 10.1080/00268976.2011.578592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Varlan A, Duca M, Fifirig M. Competition between reaction channels in electron collisions of vibrationally excited. Mol Phys 2010. [DOI: 10.1080/00268976.2010.505211] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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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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14
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Guberman SL. Role of excited core Rydberg states in dissociative recombination. J Phys Chem A 2007; 111:11254-60. [PMID: 17547378 DOI: 10.1021/jp070892q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Intermediate states formed during the dissociative recombination of molecular ions with electrons can play significant roles in determining the magnitude of the total rate coefficient. These resonances are Rydberg states of two types, that is, they can have the ground or excited states of the ion as a core. Those with the excited cores have a fundamentally different excitation mechanism than those with the ground state core. The importance of excited core states in dissociative recombination has received only limited attention in the literature. Theoretical calculations on the dissociative recombination of N2+ are reported which compare the two types of resonances. Potential curves, electronic widths, cross sections, and rate coefficients are calculated for dissociative recombination along the 2(1)Sigma(g)+ state, one of several routes for the dissociative recombination of N2+. The ground core resonances, in this example, are relatively unimportant compared to those with the excited core. Inclusion of the excited core resonances increases the rate coefficient by about a factor of 4 at room temperature, but the increase is not enough to establish 2(1)Sigma(g)+ as the dominant dissociative route.
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Affiliation(s)
- Steven L Guberman
- Institute for Scientific Research, 22 Bonad Road, Winchester, Massachusetts 01890, USA.
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15
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Adams NG, Poterya V, Babcock LM. Electron molecular ion recombination: product excitation and fragmentation. MASS SPECTROMETRY REVIEWS 2006; 25:798-828. [PMID: 16783766 DOI: 10.1002/mas.20084] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Electron-ion dissociative recombination is an important ionization loss process in any ionized gas containing molecular ions. This includes the interstellar medium, circumstellar shells, cometary comae, planetary ionospheres, fusion plasma boundaries, combustion flames, laser plasmas and chemical deposition and etching plasmas. In addition to controlling the ionization density, the process generates many radical species, which can contribute to a parallel neutral chemistry. Techniques used to obtain rate data and product information (flowing afterglows and storage rings) are discussed and recent data are reviewed including diatomic to polyatomic ions and cluster ions. The data are divided into rate coefficients and cross sections, including their temperature/energy dependencies, and quantitative identification of neutral reaction products. The latter involve both ground and electronically excited states and including vibrational excitation. The data from the different techniques are compared and trends in the data are examined. The reactions are considered in terms of the basic mechanisms (direct and indirect processes including tunneling) and recent theoretical developments are discussed. Finally, new techniques are mentioned (for product identification; electrostatic storage rings, including single and double rings; Coulomb explosion) and new ways forward are suggested.
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Affiliation(s)
- Nigel G Adams
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA.
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16
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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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17
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Tonzani S, Greene CH. Electron–molecule scattering calculations in a 3D finite element R-matrix approach. J Chem Phys 2005; 122:14111. [PMID: 15638646 DOI: 10.1063/1.1829056] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
We have implemented a three-dimensional finite element approach, based on tricubic polynomials in spherical coordinates, which solves the Schrodinger equation for scattering of a low energy electron from a molecule, approximating the electron exchange as a local potential. The potential is treated as a sum of three terms: electrostatic, exchange, and polarization. The electrostatic term can be extracted directly from ab initio codes (GAUSSIAN 98 in the work described here), while the exchange term is approximated using different local density functionals. A local polarization potential approximately describes the long range attraction to the molecular target induced by the scattering electron.
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18
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Lambert HM, Dixit AA, Davis EW, Houston PL. Quantum yields for product formation in the 120–133 nm photodissociation of O2. J Chem Phys 2004; 121:10437-46. [PMID: 15549924 DOI: 10.1063/1.1809114] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The photodissociation of O(2) in the region from 120-133 nm has been investigated using product imaging. The spectrum in this region is dominated by transitions from the ground state to the first three vibrational levels of the E (3)Sigma(u) (-) state. The O((1)D)+O((3)P) channel is the only product channel observed by product imaging for dissociation at either 124.4 nm or 120.4 nm. The O((1)D(2)) product is aligned in the molecular frame in such a way that its J vector is perpendicular to the relative velocity vector between the O((1)D) and the O((3)P). The variation in the anisotropy of dissociation is approximately predicted by considering transitions on individual lines and then taking into account the coherent excitation of overlapping resonances. At 132.7 nm, both the O((1)D)+O((3)P) and the O((3)P)+O((3)P) channels are observed with branching ratios of 0.40+/-0.08 and 0.60+/-0.09, respectively. At 130.2 nm, the quantum yield for production of O((1)D) is 0.76+/-0.28.
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Affiliation(s)
- H M Lambert
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301, USA
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19
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Sheehan CH. Dissociative recombination of N2+, O2+, and NO+: Rate coefficients for ground state and vibrationally excited ions. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003ja010132] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Hellberg F, Rosén S, Thomas R, Neau A, Larsson M, Petrignani A, van der Zande WJ. Dissociative recombination of NO+: Dynamics of the X 1Σ+ and a 3Σ+ electronic states. J Chem Phys 2003. [DOI: 10.1063/1.1557917] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Golubkov GV, Golubkov MG, Romanov AN, Buenker RJ. Dissociative recombination e− + O2+ → O(1D) + O(3P) in a strong laser field. Phys Chem Chem Phys 2003. [DOI: 10.1039/b303158f] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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22
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Peverall R, Rosén S, Peterson JR, Larsson M, Al-Khalili A, Vikor L, Semaniak J, Bobbenkamp R, Le Padellec A, Maurellis AN, van der Zande WJ. Dissociative recombination and excitation of O2+: Cross sections, product yields and implications for studies of ionospheric airglows. J Chem Phys 2001. [DOI: 10.1063/1.1349079] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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23
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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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24
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Lewis BR, Gibson ST, Banerjee SS, Lefebvre-Brion H. Relations between Rydberg-valence interactions in the O2 molecule. J Chem Phys 2000. [DOI: 10.1063/1.482035] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Amitay Z, Baer A, Dahan M, Knoll L, Lange M, Levin J, Schneider IF, Schwalm D, Suzor-Weiner A, Vager Z, Wester R, Wolf A, Zajfman D. Dissociative recombination of HD+ in selected vibrational quantum states. Science 1998; 281:75-8. [PMID: 9651247 DOI: 10.1126/science.281.5373.75] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Rate coefficients for dissociative recombination of HD+ in selected vibrational states have been measured by a combination of two molecular fragment imaging methods by using the heavy-ion storage ring technique. Recombination fragment imaging yields state-to-state reaction rates. These rates are converted to rate coefficients by using vibrational level populations of the stored ion beam, derived from nuclear coordinate distributions measured on extracted ions. The results show strongly increasing rate coefficients for high vibrational excitation, where additional dissociation routes open up, in agreement with a theoretical calculation. Very low rate coefficients are found for certain, isolated vibrational states.
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Affiliation(s)
- Z Amitay
- Z. Amitay, A. Baer, M. Dahan, J. Levin, Z. Vager, D. Zajfman, Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel. L. Knoll, M. Lange, D. Schwalm, R. Wester, A. Wolf, Max-Planck-Institut fur Kernphysik and
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26
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Complex formation in electron-ion recombination of molecular ions. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s1071-9687(98)80004-x] [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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27
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Ogawa K, Nakata K, Ichikawa K. Molecular Structures of Zinc Complexes with Bisbenzimidazole Ligands in Crystals and the Kinetics of Ligand-Exchange Reactions in Their Solutions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1997. [DOI: 10.1246/bcsj.70.2925] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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28
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Affiliation(s)
- Steven L. Guberman
- Institute for Scientific Research, 33 Bedford Street, Lexington, MA 02173, USA
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29
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Nakamura H. THEORETICAL STUDIES OF CHEMICAL DYNAMICS: Overview of Some Fundamental Mechanisms. Annu Rev Phys Chem 1997; 48:299-328. [PMID: 15012447 DOI: 10.1146/annurev.physchem.48.1.299] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Recent remarkable progress in theoretical studies of (a) quantum dynamics of chemical reactions, (b) characteristics and dynamics of superexcited states of molecules, (c) nonadiabatic transitions at potential curve crossings, and (d) multidimensional tunneling is reviewed briefly. Underlying common basic concepts and fundamental mechanisms such as adiabaticity and nonadiabatic transition are extracted and discussed in order to facilitate a comprehensive understanding of chemical dynamics. Not only the basic theoretical methodologies but also the intriguing dynamical aspects of each subject are explained as simply as possible.
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Affiliation(s)
- H Nakamura
- Department of Theoretical Studies, Institute for Molecular Science, Myodaiji, Okazaki 444, Japan.
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30
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Kella D, Vejby-Christensen L, Johnson PJ, Pedersen HB, Andersen LH. The Source of Green Light Emission Determined from a Heavy-Ion Storage Ring Experiment. Science 1997. [DOI: 10.1126/science.276.5318.1530] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- D. Kella
- Institute of Physics and Astronomy, University of Aarhus, DK 8000, Aarhus C, Denmark
| | - L. Vejby-Christensen
- Institute of Physics and Astronomy, University of Aarhus, DK 8000, Aarhus C, Denmark
| | - P. J. Johnson
- Institute of Physics and Astronomy, University of Aarhus, DK 8000, Aarhus C, Denmark
| | - H. B. Pedersen
- Institute of Physics and Astronomy, University of Aarhus, DK 8000, Aarhus C, Denmark
| | - L. H. Andersen
- Institute of Physics and Astronomy, University of Aarhus, DK 8000, Aarhus C, Denmark
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Golubkov GV, Golubkov MG, Drygin SV, Ivanov GK. Dissociative recombination of electrons and molecular ions. Russ Chem Bull 1996. [DOI: 10.1007/bf01434195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Strömholm C, Schneider IF, Sundström G, Carata L, Danared H, Datz S, Dulieu O, Källberg A, Urbain X, Zengin V, Suzor-Weiner A, Larsson M. Absolute cross sections for dissociative recombination of HD+: Comparison of experiment and theory. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 52:R4320-R4323. [PMID: 9912849 DOI: 10.1103/physreva.52.r4320] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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The semiclassical—classical path theory of direct electron—ion dissociative recombination and e− + H3+ recombination. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0168-1176(95)04293-t] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Lewis BR, England JP, Winkel RJ, Banerjee SS, Dooley PM, Gibson ST, Baldwin KG. Experimental observation of the lowest 1 Sigma u+ valence state of O2. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 52:2717-2733. [PMID: 9912553 DOI: 10.1103/physreva.52.2717] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Lawley K, Ridley T, Min Z, Wilson P, Al-Kahali M, Donovan R. Vibronic coupling between Rydberg and ion-pair states of I2 investigated by (2+1) resonance enhanced multiphoton ionization spectroscopy. Chem Phys 1995. [DOI: 10.1016/0301-0104(95)00158-k] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Zajfman D, Amitay Z. Measurement of the vibrational populations of molecular ions and its application to dissociative recombination in storage rings. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 52:839-842. [PMID: 9912307 DOI: 10.1103/physreva.52.839] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Lewis BR, Banerjee SS, Gibson ST. Asymmetric line shapes in the indirect predissociation of thef 1Σu+Rydberg state of O2. J Chem Phys 1995. [DOI: 10.1063/1.469379] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Guberman SL. Dissociative recombination without a curve crossing. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 49:R4277-R4280. [PMID: 9910856 DOI: 10.1103/physreva.49.r4277] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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LeClair LR, McConkey JW. Selective detection of O(1S0) following electron impact dissociation of O2 and N2O using a XeO* conversion technique. J Chem Phys 1993. [DOI: 10.1063/1.466056] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gao H, Jungen C, Greene CH. Predissociation of H2 in the 3p pi D 1 Pi u+ state. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:4877-4884. [PMID: 9909519 DOI: 10.1103/physreva.47.4877] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Electron-Ion Continuum-Continuum Mixing in Dissociative Recombination. DISSOCIATIVE RECOMBINATION 1993. [DOI: 10.1007/978-1-4615-2976-7_5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Recent Developments and Perspectives in the Treatment of Dissociative Recombination and Related Processes. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/978-1-4615-2976-7_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Fox JL. Dissociative Recombination in Planetary Ionospheres. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/978-1-4615-2976-7_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Schneider IF, Dulieu O, Giusti-Suzor A. Resonances in the dissociative recombination of H2+ with slow electrons. PHYSICAL REVIEW LETTERS 1992; 68:2251. [PMID: 10045345 DOI: 10.1103/physrevlett.68.2251] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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