1
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Yang D, Guo H. A time-dependent quantum approach to dissociative recombination, associative ionization, and Penning ionization. J Chem Phys 2023; 159:044105. [PMID: 37486044 DOI: 10.1063/5.0156998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 07/06/2023] [Indexed: 07/25/2023] Open
Abstract
A time-dependent wave packet method is introduced for calculating the integral and differential cross sections for the dissociative recombination (DR), associative ionization (AI), and Penning ionization (PI) processes. This method is demonstrated for DR/AI of the N + O ↔ NO+ + e- system and PI for the He* + Ar → He + Ar+ + e- system. Good agreement with previous theoretical and experimental results is obtained for these DR, AI, and PI processes. This method has the potential to provide a quantitative characterization of polyatomic ionization-involved processes on multidimensional potential energy surfaces.
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Affiliation(s)
- Dongzheng Yang
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
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2
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Falcinelli S, Vecchiocattivi F, Pirani F. The topology of the reaction stereo-dynamics in chemi-ionizations. Commun Chem 2023; 6:30. [PMID: 36782019 PMCID: PMC9925729 DOI: 10.1038/s42004-023-00830-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 02/03/2023] [Indexed: 02/15/2023] Open
Abstract
Details on the stereo-dynamic topology of chemi-ionizations highlight the role of the centrifugal barrier of colliding reactants: it acts as a selector of the orbital quantum number effective for reaction in a state-to-state treatment. Here, an accurate internally consistent formulation of the Optical interaction potentials, obtained by the combined analysis of scattering and spectroscopic experimental findings, casts light on structure, energy and angular momentum couplings of the precursor (pre-reactive) state controlling the stereo-dynamics of prototypical chemi-ionization reactions. The closest approach (turning point) of reagents, is found to control the relative weight of two different reaction mechanisms: (i) A direct mechanism stimulated by exchange chemical forces mainly acting at short separation distances and high collision energy; (ii) An indirect mechanism, caused by the combination of weak chemical and physical forces dominant at larger distances, mainly probed at low collision energy, that can be triggered by a virtual photon exchange between reagents.
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Affiliation(s)
- Stefano Falcinelli
- Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125, Perugia, Italy.
| | - Franco Vecchiocattivi
- grid.9027.c0000 0004 1757 3630Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Fernando Pirani
- grid.9027.c0000 0004 1757 3630Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy ,grid.9027.c0000 0004 1757 3630Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
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3
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Falcinelli S, Vecchiocattivi F, Brunetti BG, Parriani M, Gigliotti G, Stranges S, Pirani F. Basic features of Ne*-HX (X = Cl, Br) chemi-ionization reactions. RSC Adv 2022; 12:7587-7593. [PMID: 35424672 PMCID: PMC8982342 DOI: 10.1039/d1ra08904h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 02/28/2022] [Indexed: 12/30/2022] Open
Abstract
Total and partial ionization cross sections for Ne*(3P2,0)-HX (X = Cl, Br) are presented in a comparative way as a function of the collision energy between 0.02-0.5 eV. New mass spectrometric data on Ne*-HBr chemi-ionization are discussed and analyzed with already published data on Ne*-HCl, highlighting similarities and differences of the collisional stereodynamics of the two systems. Basic features of the interaction potentials, driving reactive collisions, suggest that reaction channels, leading to the formation of parent HX+ ions in the ground and excited electronic state and to the formation of associated NeHX+ ions as well as of NeH+ proton transfer species, are selectively opened within angular cones exhibiting different orientation and acceptance.
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Affiliation(s)
- Stefano Falcinelli
- Department of Civil and Environmental Engineering, University of Perugia Via G. Duranti 93 06125 Perugia Italy
| | - Franco Vecchiocattivi
- Department of Civil and Environmental Engineering, University of Perugia Via G. Duranti 93 06125 Perugia Italy
| | - Brunetto Giovanni Brunetti
- Department of Chemistry, Biology and Biotechnologies, University of Perugia Via Elce di Sotto 8 06123 Perugia Italy
| | - Marco Parriani
- Department of Civil and Environmental Engineering, University of Perugia Via G. Duranti 93 06125 Perugia Italy
| | - Giovanni Gigliotti
- Department of Civil and Environmental Engineering, University of Perugia Via G. Duranti 93 06125 Perugia Italy
| | - Stefano Stranges
- Department of Chemistry and Drug Technologies, University Sapienza Rome 00185 Italy
| | - Fernando Pirani
- Department of Civil and Environmental Engineering, University of Perugia Via G. Duranti 93 06125 Perugia Italy
- Department of Chemistry, Biology and Biotechnologies, University of Perugia Via Elce di Sotto 8 06123 Perugia Italy
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4
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Tanteri S, Gordon SDS, Zou J, Osterwalder A. Study of He*/Ne*+Ar, Kr, N 2, H 2, D 2 Chemi-Ionization Reactions by Electron Velocity-Map Imaging. J Phys Chem A 2021; 125:10021-10034. [PMID: 34762426 DOI: 10.1021/acs.jpca.1c07232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The chemi-ionization of Ar, Kr, N2, H2, and D2 by Ne(3P2) and of Ar, Kr, and N2 by He(3S1) was studied by electron velocity map imaging (e-VMI) in a crossed molecular beam experiment. A curved magnetic hexapole was used to state-select the metastable species. Collision energies of 60 meV were obtained by individually controlling the beam velocities of both reactants. The chemi-ionization of atoms and molecules can proceed along different channels, among them Penning ionization and associative ionization. The evolution of the reaction is influenced by the internal redistribution of energy, which happens at the first reaction step that involves the emission of an electron. We designed and built an e-VMI spectrometer in order to investigate the electron kinetic energy distribution, which is related to the internal state distribution of the ionic reaction products. The analysis of the electron kinetic energy distributions allows an estimation of the ratio between the two-reaction channel Penning and associative ionization. In the molecular cases the vibrational or electronic excitation enhanced the conversion of internal energy into the translational energy of the forming ions, thus influencing the reaction outcome.
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Affiliation(s)
- Silvia Tanteri
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Sean D S Gordon
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Junwen Zou
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Andreas Osterwalder
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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5
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Falcinelli S, Vecchiocattivi F, Farrar JM, Brunetti BG, Cavalli S, Pirani F. Stereo-dynamical effects in chemi-ionization reactions of atmospheric O2 and N2 molecules promoted by collisions with Ne*(3P2,0) atoms. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138813] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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Falcinelli S, Vecchiocattivi F, Farrar JM, Pirani F. Chemi-Ionization Reactions and Basic Stereodynamical Effects in Collisions of Atom-Molecule Reagents. J Phys Chem A 2021; 125:3307-3315. [PMID: 33853326 PMCID: PMC8154608 DOI: 10.1021/acs.jpca.1c00688] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/28/2021] [Indexed: 12/02/2022]
Abstract
A new theoretical method, developed by our laboratory to describe the microscopic dynamics of gas-phase elementary chemi-ionization reactions, has been applied recently to study prototype atom-atom processes involving reactions between electronically excited metastable Ne*(3P2,0) and heavier noble gas atoms. Important aspects of electronic rearrangement selectivity have been emphasized that suggested the existence of two fundamental microscopic reaction mechanisms. The distinct mechanisms, which are controlled by intermolecular forces of chemical and noncovalent nature respectively, emerge under different conditions, and their balance depends on the collision energy regime investigated. The present paper provides the first step for the extension of the method to cases involving molecules of increasing complexity, whose chemi-ionization reactions are of relevance in several fields of basic and applied researches. The focus is here on the reactions of Ne* with simple inorganic molecules as Cl2 and NH3, and the application of the method discloses relevant features of the reaction microscopic evolution. In particular, this study shows that the balance of two fundamental reaction mechanisms depends not only on the collision energy and on the relative orientation of reagents but also on the orbital angular momentum of each collision complex. The additional insights so emphasized are of general relevance to assess in detail the stereodynamics of many other elementary processes.
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Affiliation(s)
- Stefano Falcinelli
- Department
of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Franco Vecchiocattivi
- Department
of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - James M. Farrar
- Department
of Chemistry, University of Rochester, 14627 Rochester, New York, United States
| | - Fernando Pirani
- Department
of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
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7
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Falcinelli S, Vecchiocattivi F, Pirani F. Electronic Rearrangements and Angular Momentum Couplings in Quantum State-to-State Channels of Prototype Oxidation Processes. J Phys Chem A 2021; 125:1461-1467. [PMID: 33593059 PMCID: PMC8023699 DOI: 10.1021/acs.jpca.0c09701] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 02/05/2021] [Indexed: 11/29/2022]
Abstract
An innovative theoretical method to describe the microscopic dynamics of chemi-ionization reactions as prototype oxidation processes driven by selective electronic rearrangements has been recently published. It was developed and applied to reactions of Ne* atoms excited in their metastable 3PJ state, and here, its physical background is extensively described in order to provide a clear description of the microscopic phenomenon underlying the chemical reactivity of the oxidative processes under study. It overcomes theoretical models previously proposed and reproduces experimental results obtained in different laboratories. Two basic reaction mechanisms have been identified: (i) at low collision energies, a weakly bounded transition state is formed which spontaneously ionizes through a radiative physical mechanism (photoionization); (ii) in the hyperthermal regime, an elementary oxidation process occurs. In this paper, the selectivity of the electronic rearrangements triggering the two mechanisms has been related to the angular momentum couplings by Hund's cases, casting further light on fundamental aspects of the reaction stereodynamics of general interest. The obtained results allow peculiar characteristics and differences of the terrestrial oxidizing chemistry compared to that of astrochemical environments to be highlighted.
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Affiliation(s)
- Stefano Falcinelli
- Department
of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Franco Vecchiocattivi
- Department
of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Fernando Pirani
- Department
of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
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8
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Falcinelli S, Farrar JM, Vecchiocattivi F, Pirani F. Quantum-State Controlled Reaction Channels in Chemi-ionization Processes: Radiative (Optical-Physical) and Exchange (Oxidative-Chemical) Mechanisms. Acc Chem Res 2020; 53:2248-2260. [PMID: 32930573 PMCID: PMC8011800 DOI: 10.1021/acs.accounts.0c00371] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Indexed: 01/29/2023]
Abstract
ConspectusMost chemical processes are triggered by electron or charge transfer phenomena (CT). An important class of processes involving CT are chemi-ionization reactions. Such processes are very common in nature, involving neutral species in ground or excited electronic states with sufficient energy (X*) to yield ionic products, and are considered as the primary initial step in flames. They are characterized by pronounced electronic rearrangements that take place within the collisional complex (X···M)* formed by approaching reagents, as shown by the following scheme, where M is an atomic or molecular target: X* + M → (X···M)* → [(X+···M) ↔ (X···M+)]e- → via e - CT (X···M)+ + e- → final ions.Despite their important role in fundamental and applied research, combustion, plasmas, and astrochemistry, a unifying description of these basic processes is still lacking. This Account describes a new general theoretical methodology that demonstrates, for the first time, that chemi-ionization reactions are prototypes of gas phase oxidation processes occurring via two different microscopic mechanisms whose relative importance varies with collision energy, Ec, and separation distance, R. These mechanisms are illustrated for simple collisions involving Ne*(3P2,0) and noble gases (Ng). In thermal and hyperthermal collisions probing interactions at intermediate and short R, the transition state [(Ne···Ng)+]e- is a molecular species described as a molecular ion core with an orbiting Rydberg electron in which the neon reagent behaves as a halogen atom (i.e., F) with high electron affinity promoting chemical oxidation. Conversely, subthermal collisions favor a different reaction mechanism: Ng chemi-ionization proceeds through another transition state [Ne*······Ng], a weakly bound diatomic-lengthened complex where Ne* reagent, behaving as a Na atom, loses its metastability and stimulates an electron ejection from M by a concerted emission-absorption of a "virtual" photon. This is a physical radiative mechanism promoting an effective photoionization. In the thermal regime of Ec, there is a competition between these two mechanisms. The proposed method overcomes previous approaches for the following reasons: (1) it is consistent with all assumptions invoked in previous theoretical descriptions dating back to 1970; (2) it provides a simple and general description able to reproduce the main experimental results from our and other laboratories during last 40 years; (3) it demonstrates that the two "exchange" and "radiative" mechanisms are simultaneously present with relative weights that change with Ec (this viewpoint highlights the fact that the "canonical" chemical oxidation process, dominant at high Ec, changes its nature in the subthermal regime to a direct photoionization process; therefore, it clarifies differences between the cold chemistry of terrestrial and interstellar environments and the energetic one of combustion and flames); (4) the proposed method explicitly accounts for the influence of the degree of valence orbital alignment on the selective role of each reaction channel as a function of Ec and also permits a description of the collision complex, a rotating adduct, in terms of different Hund's cases of angular momentum couplings that are specific for each reaction channel; (5) finally, the method can be extended to reaction mechanisms of redox, acid-base, and other important condensed phase reactions.
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Affiliation(s)
- Stefano Falcinelli
- Dipartimento
di Ingegneria Civile ed Ambientale, Università
di Perugia, 06125 Perugia, Italy
| | - James M. Farrar
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Franco Vecchiocattivi
- Dipartimento
di Ingegneria Civile ed Ambientale, Università
di Perugia, 06125 Perugia, Italy
| | - Fernando Pirani
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università
di Perugia, 06123 Perugia, Italy
- Istituto
di Scienze e Tecnologie Chimiche “G. Natta” CNR-SCITEC, 06123 Perugia, Italy
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9
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Falcinelli S, Vecchiocattivi F, Pirani F. General treatment for stereo-dynamics of state-to-state chemi-ionization reactions. Commun Chem 2020; 3:64. [PMID: 36703400 PMCID: PMC9814700 DOI: 10.1038/s42004-020-0312-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 04/30/2020] [Indexed: 01/29/2023] Open
Abstract
The investigation of chemi-ionization processes provides unique information on how the reaction dynamics depend on the energy and structure of the transition state which relate to the symmetry, relative orientation of reagent/product valence electron orbitals, and selectivity of electronic rearrangements. Here we propose a theoretical approach to formulate the optical potential for Ne*(3P2,0) noble gas atom chemi-ionizations as prototype oxidation processes. We include the selective role of atomic alignment and of the electron transfer mechanism. The state-to-state reaction probability is evaluated and a unifying description of the main experimental findings is obtained. Further, we reproduce the results of recent and advanced molecular beam experiments with a state selected Ne* beam.The selective role of electronic rearrangements within the transition state, quantified through the use of suitable operative relations, could cast light on many other chemical processes more difficult to characterize.
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Affiliation(s)
- Stefano Falcinelli
- grid.9027.c0000 0004 1757 3630Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Franco Vecchiocattivi
- grid.9027.c0000 0004 1757 3630Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Fernando Pirani
- grid.9027.c0000 0004 1757 3630Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
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10
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Falcinelli S, Pirani F, Candori P, Brunetti BG, Farrar JM, Vecchiocattivi F. A New Insight on Stereo-Dynamics of Penning Ionization Reactions. Front Chem 2019; 7:445. [PMID: 31275926 PMCID: PMC6591474 DOI: 10.3389/fchem.2019.00445] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 05/31/2019] [Indexed: 12/25/2022] Open
Abstract
Recent developments in the experimental study of Penning ionization reactions are presented here to cast light on basic aspects of the stereo-dynamics of the microscopic mechanisms involved. They concern the dependence of the reaction probability on the relative orientation of the atomic and molecular orbitals of reagents and products. The focus is on collisions between metastable Ne*(3P2, 0) atoms with other noble gas atoms or molecules, for which play a crucial role both the inner open-shell structure of Ne* and the HOMO orbitals of the partner. Their mutual orientation with respect to the intermolecular axis controls the characteristics of the intermolecular potential, which drives the collision dynamics and the reaction probability. The investigation of ionization processes of water, the prototype of hydrogenated molecules, suggested that the ground state of water ion is produced when Ne* approaches H2O perpendicularly to its plane. Conversely, collisions addressed toward the lone pair, aligned along the water C2v symmetry axis, generates electronically excited water ions. However, obtained results refer to a statistical/random orientation of the open shell ionic core of Ne*. Recently, the attention focused on the ionization of Kr or Xe by Ne*, for which we have been able to characterize the dependence on the collision energy of the branching ratio between probabilities of spin orbit resolved elementary processes. The combined analysis of measured PIES spectra suggested the occurrence of contributions from four different reaction channels, assigned to two distinct spin-orbit states of the Ne*(3P2, 0) reagent and two different spin-orbit states of the ionic M+(2P3/2, 1/2) products (M = Kr, Xe). The obtained results emphasized the reactivity change of 3P0 atoms with respect to 3P2, in producing ions in 2P3/2 and 2P1/2 sublevels, as a function of the collision energy. These findings have been assumed to arise from a critical balance of adiabatic and non-adiabatic effects that control formation and electronic rearrangement of the collision complex, respectively. From these results we are able to characterize for the first time, according to our knowledge, the state to state reaction probability for the ionization of Kr and Xe by Ne* in both 3P2 and 3P0 sublevels.
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Affiliation(s)
- Stefano Falcinelli
- Department of Civil and Environmental Engineering, University of Perugia, Perugia, Italy
| | - Fernando Pirani
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Perugia, Italy
| | - Pietro Candori
- Department of Civil and Environmental Engineering, University of Perugia, Perugia, Italy
| | - Brunetto G Brunetti
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Perugia, Italy
| | - James M Farrar
- Department of Chemistry, University of Rochester, Rochester, NY, United States
| | - Franco Vecchiocattivi
- Department of Civil and Environmental Engineering, University of Perugia, Perugia, Italy
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11
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Bibelnik N, Gersten S, Henson AB, Lavert-Ofir E, Shagam Y, Skomorowski W, Koch CP, Narevicius E. Cold temperatures invert product ratios in Penning ionisation reactions with argon. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1594421] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Natan Bibelnik
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Sasha Gersten
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Alon B Henson
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Etay Lavert-Ofir
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Yuval Shagam
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel
| | | | | | - Edvardas Narevicius
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel
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12
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Falcinelli S, Vecchiocattivi F, Pirani F. The electron couplings in the transition states: The stereodynamics of state to state autoionization processes. J Chem Phys 2019; 150:044305. [PMID: 30709283 DOI: 10.1063/1.5051174] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Measurements of the kinetic energy distribution of electrons, emitted in collision between Ne*(3P2,0) and Kr(1S0) and Xe(1S0), have been performed in a crossed molecular beam apparatus which employs a mass spectrometer and a hemispherical electron analyzer as detectors. The analysis of the obtained experimental results provides new insights on electronic rearrangements and electronic angular momentum coupling effects that determine relevant properties of the transition state of autoionization processes, and that we have found useful to classify as adiabatic and non-adiabatic effects. In particular, while the adiabatic effects control sequence, energy, and symmetry of quantum states accessible to both reagents and products in the probed collision energy range, the non-adiabatic ones trigger the passage from entrance to exit channels. The obtained results are important not only to compact previous theoretical schemes of autoionization reactions in a unified representation but also to cast light on the role of electronic rearrangements within the transition state of many other types of chemical processes that are more difficult to characterize.
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Affiliation(s)
- Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Franco Vecchiocattivi
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
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13
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Falcinelli S, Vecchiocattivi F, Pirani F. Adiabatic and Nonadiabatic Effects in the Transition States of State to State Autoionization Processes. PHYSICAL REVIEW LETTERS 2018; 121:163403. [PMID: 30387669 DOI: 10.1103/physrevlett.121.163403] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Indexed: 06/08/2023]
Abstract
The energy distribution of electrons, emitted from collisions between Ne^{*}(^{3}P_{2,0}) and Kr(^{1}S_{0}), have been measured under high resolution conditions in a crossed molecular beam apparatus containing a hemispherical electron analyzer as detector. The experimental results provide new insights on the electronic adiabatic and nonadiabatic effects in the stereodynamics of state to state atomic and molecular collisions, controlling relevant properties of the transition state of autoionization processes. In particular, while the adiabatic effects determine sequence, energy, and symmetry of quantum states accessible both to reagents and products, the nonadiabatic effects trigger the passage from entrance to exit channels.
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Affiliation(s)
- Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Franco Vecchiocattivi
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
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14
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Quantum-state-controlled channel branching in cold Ne( 3P 2)+Ar chemi-ionization. Nat Chem 2018; 10:1190-1195. [PMID: 30297754 DOI: 10.1038/s41557-018-0152-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 08/31/2018] [Indexed: 11/08/2022]
Abstract
A prerequisite to gain a complete understanding of the most basic aspects of chemical reactions is the ability to perform experiments with complete control over the reactant degrees of freedom. By controlling these, details of a reaction mechanism can be investigated and ultimately manipulated. Here, we present a study of chemi-ionization-a fundamental energy-transfer reaction-under completely controlled conditions. The collision energy of the reagents was tuned from 0.02 K to 1,000 K, with the orientation of the excited Ne atom relative to Ar fully specified by an external magnetic field. Chemi-ionization of Ne(3P2) and Ar in these conditions enables a detailed investigation of how the reaction proceeds, and provides us with a means to control the branching ratio between the two possible reaction outcomes. The merged-beam experimental technique used here allows access to a low-energy regime in which the atoms dynamically reorient into a favourable configuration for reaction, irrespective of their initial orientations.
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15
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Zou J, Gordon SDS, Tanteri S, Osterwalder A. Stereodynamics of Ne( 3P 2) reacting with Ar, Kr, Xe, and N 2. J Chem Phys 2018; 148:164310. [PMID: 29716200 DOI: 10.1063/1.5026952] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Stereodynamics experiments of Ne(3P2) reacting with Ar, Kr, Xe, and N2 leading to Penning and associative ionization have been performed in a crossed molecular beam apparatus. A curved magnetic hexapole was used to state-select and polarize Ne(3P2) atoms which were then oriented in a rotatable magnetic field and crossed with a beam of Ar, Kr, Xe, or N2. The ratio of associative to Penning ionization was recorded as a function of the magnetic field direction for collision energies between 320 cm-1 and 500 cm-1. Reactivities are obtained for individual states that differ only in Ω, the projection of the neon total angular momentum vector on the inter-particle axis. The results are rationalized on the basis of a model involving a long-range and a short-range reaction mechanism. Substantially lower probability for associative ionization was observed for N2, suggesting that predissociation plays a critical role in the overall reaction pathway.
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Affiliation(s)
- Junwen Zou
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Sean D S Gordon
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Silvia Tanteri
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Andreas Osterwalder
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
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Jankunas J, Bertsche B, Jachymski K, Hapka M, Osterwalder A. Dynamics of gas phase Ne* + NH3 and Ne* + ND3 Penning ionisation at low temperatures. J Chem Phys 2014; 140:244302. [PMID: 24985633 DOI: 10.1063/1.4883517] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Justin Jankunas
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Benjamin Bertsche
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | | | - Michał Hapka
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Andreas Osterwalder
- Institute for Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
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17
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Brunetti BG, Candori P, Falcinelli S, Pirani F, Vecchiocattivi F. The stereodynamics of the Penning ionization of water by metastable neon atoms. J Chem Phys 2014; 139:164305. [PMID: 24182027 DOI: 10.1063/1.4826101] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The stereodynamics of the Penning ionization of water molecules by collision with metastable neon atoms, occurring in the thermal energy range, is of great relevance for the understanding of fundamental aspects of the physical chemistry of water. This process has been studied by analyzing the energy spectrum of the emitted electrons previously obtained in our laboratory in a crossed beam experiment [B. G. Brunetti, P. Candori, D. Cappelletti, S. Falcinelli, F. Pirani, D. Stranges, and F. Vecchiocattivi, Chem. Phys. Lett. 539-540, 19 (2012)]. For the spectrum analysis, a novel semiclassical method is proposed, that assumes ionization events as mostly occurring in the vicinities of the collision turning points. The potential energy driving the system in the relevant configurations of the entrance and exit channels, used in the spectrum simulation, has been formulated by the use of a semiempirical method. The analysis puts clearly in evidence how different approaches of the metastable atom to the water molecule lead to ions in different electronic states. In particular, it provides the angular acceptance cones where the selectivity of the process leading to the specific formation of each one of the two energetically possible ionic product states of H2O(+) emerges. It is shown how the ground state ion is formed when neon metastable atoms approach water mainly perpendicularly to the molecular plane, while the first excited electronic state is formed when the approach occurs preferentially along the C2v axis, on the oxygen side. An explanation is proposed for the observed vibrational excitation of the product ions.
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18
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Hapka M, Chałasiński G, Kłos J, Żuchowski PS. First-principle interaction potentials for metastable He(3S) and Ne(3P) with closed-shell molecules: Application to Penning-ionizing systems. J Chem Phys 2013; 139:014307. [DOI: 10.1063/1.4812182] [Citation(s) in RCA: 18] [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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19
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20
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Matherson KJ, Glover RD, Laban DE, Sang RT. Absolute metastable atom-atom collision cross section measurements using a magneto-optical trap. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:073102. [PMID: 17672750 DOI: 10.1063/1.2754444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We present a new technique to measure absolute total collision cross sections from metastable neon atoms. The technique is based on the observation of the decay rate of trapped atoms as they collide with room temperature atoms. We present the first measurement of this kind using trapped neon atoms in the (3)P(2) metastable state colliding with thermal ground state argon. The measured cross section has a value of 556+/-26 A(2).
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Affiliation(s)
- K J Matherson
- Centre for Quantum Dynamics, Griffith University, Nathan QLD 4111, Australia
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21
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Arango CA, Shapiro M, Brumer P. Cold atomic collisions: coherent control of penning and associative ionization. PHYSICAL REVIEW LETTERS 2006; 97:193202. [PMID: 17155624 DOI: 10.1103/physrevlett.97.193202] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2006] [Indexed: 05/12/2023]
Abstract
Coherent control techniques are computationally applied to cold (1 mK<T<1 K) and ultracold (T<1 muK) Ne*(3s,3P2)+Ar(1S0) collisions. We show that by using various initial superpositions of the Ne*(3s,3P2) M={-2,-1,0,1,2} Zeeman sublevels it is possible to reduce the Penning ionization and associative ionization cross sections by as much as 4 orders of magnitude. It is also possible to drastically change the ratio of these two processes. The results are based on combining, within the "rotating atom approximation", empirical and ab initio ionization widths.
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Affiliation(s)
- Carlos A Arango
- Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto M5S 3H6, Canada
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22
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Arango CA, Shapiro M, Brumer P. Coherent control of collision processes: Penning versus associative ionization. J Chem Phys 2006; 125:094315. [PMID: 16965088 DOI: 10.1063/1.2336430] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Coherent control theory is applied to the control of Ne*(3s,(3)P2)+Ar((1)S0) collisions and computations are shown that display extensive control over these processes. Indeed we demonstrate that it is possible to essentially turn on and off the cross sections for both the Penning and associative ionization processes. This facility arises from the interference between matter waves induced by creating a linear superposition of the degenerate M={-2,-1,0,1,2} Zeeman sublevels of the Ne*(3s,(3)P2) target atom. The computations, conducted at collision energies in the 1-8 kcal/mole range, are based on combining, within the "rotating atom approximation," empirically derived and ab initio ionization widths.
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Affiliation(s)
- Carlos A Arango
- Chemical Physics Theory Group, Department of Chemistry, University of Toronto, Toronto M5S3H6, Canada
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23
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Biondini F, Brunetti BG, Candori P, De Angelis F, Falcinelli S, Tarantelli F, Moix Teixidor M, Pirani F, Vecchiocattivi F. Penning ionization of N2O molecules by He*(2S3,1) and Ne*(P2,03) metastable atoms: A crossed beam study. J Chem Phys 2005; 122:164307. [PMID: 15945684 DOI: 10.1063/1.1884604] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The energetics of [Rg... N2O]* autoionizing collision complexes (where Rg=He or Ne) and their dynamical evolution have been studied in a crossed beam apparatus, respectively, by Penning ionization electron spectroscopy (PIES) and by mass spectrometry (MS) techniques in the thermal energy range. The PIES spectra, detected by an electron energy analyzer, were recorded for both complexes at four different collision energies. Such spectra allowed the determination of the energy shifts for Penning electron energy distributions, and the branching ratios for the population of different electronic states and for the vibrational population in the molecular nascent ions. For the [Ne...N2O]* collision complex it was found, by MS, that the autoionization leads to the formation of N2O+, NO+, O+, and NeN2O+ product ions whose total and partial cross sections were measured in the collision energy range between 0.03 and 0.2 eV. The results are analyzed exploiting current models for the Penning ionization process: the observed collision energy dependence in the PIES spectra as well as in the cross sections are correlated with the nature of the N2O molecule orbitals involved in the ionization and are discussed in term of the Rg-N2O interaction potentials, which are estimated by using a semiempirical method developed in our laboratory.
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Affiliation(s)
- Francesco Biondini
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, 06125 Perugia, Italy
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25
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Jacobs BA, Rice WA, Siska PE. Energy dependence of the Penning ionization electron spectrum of Ne*(3s 3P2,0)+Ar. J Chem Phys 2003. [DOI: 10.1063/1.1536615] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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26
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Sadeghi N, Setser DW, Francis A, Czarnetzki U, Döbele HF. Quenching rate constants for reactions of Ar(4p′[1/2]0, 4p[1/2]0, 4p[3/2]2, and 4p[5/2]2) atoms with 22 reagent gases. J Chem Phys 2001. [DOI: 10.1063/1.1388037] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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27
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Morgner H. Population of fine-structure levels of Ar+(2P3/2,1/2) in Penning ionisation of Ar by metastable Ne*. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0022-3700/18/2/013] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Buermann L, Burdenski S, Feltgen R, Hoffmann G. Chemi-ionisation of Xe in thermal collisions with He*(21S) and He*(23S) metastable atoms. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0022-3700/20/12/025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Brunetti B, Candori P, De Andres J, Pirani F, Rosi M, Falcinelli S, Vecchiocattivi F. Dissociative Ionization of Methyl Chloride and Methyl Bromide by Collision with Metastable Neon Atoms. J Phys Chem A 1997. [DOI: 10.1021/jp970945b] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Khadka DB, Fukuchi Y, Kitajima M, Hidaka K, Kouchi N, Hatano Y, Ukai M. Deexcitation of Ne(3P1) and Ne(3P2) in collisions with Ar, Kr, and Xe. J Chem Phys 1997. [DOI: 10.1063/1.474581] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Rickey D, Krenos J. Molecular beam study of the collisions of state-monitored, metastable noble gas atoms with O2(X 3Σg−). J Chem Phys 1997. [DOI: 10.1063/1.473420] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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32
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Op de Beek SS, Driessen JPJ, Beijerinck HCW, Verhaar BJ. Calculation of two-center integrals involving a rapidly oscillating free electron wave function. J Chem Phys 1997. [DOI: 10.1063/1.473034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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33
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Aardema T, van Asten N, Driessen J, Vredenbregt E, Beijerinck H. Excitation transfer in collisions of Kr{4p55p; 3D3} with N2 molecules. Chem Phys 1996. [DOI: 10.1016/0301-0104(95)00405-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Ferkel H, Koch A, Feltgen R. Fine‐structure transitions in metastable Ne*(3P0,2) colliding with ground state rare gases at thermal energies. J Chem Phys 1994. [DOI: 10.1063/1.466463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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35
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Morishima Y, Yoshida H, Ukai M, Shinsaka K, Kouchi N, Hatano Y. Deexcitation of He(2 1P) in collisions with diatomic molecules. J Chem Phys 1992. [DOI: 10.1063/1.463957] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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36
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Morishima Y, Ukai M, Kouchi N, Hatano Y. Optical model calculation of the total Penning ionization cross sections for He(2 1P)–Ar, Kr, and Xe. J Chem Phys 1992. [DOI: 10.1063/1.462323] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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37
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Driessen J, Manders M, van de Weijer F, Sandker G, Boom W, Beijerinck H, Verhaar B. Total ionization cross sections for Ne**{(2p)5(3p); J = 3}-molecule systems: Absolute values and polarization effects. Chem Phys 1991. [DOI: 10.1016/0301-0104(91)80120-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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38
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Baudon J, Feron P, Miniatura C, Perales F, Reinhardt J, Robert J, Haberland H, Brunetti B, Vecchiocattivi F. Optical potentials for Ne*(3P2,0)–Ar, N2interactions. J Chem Phys 1991. [DOI: 10.1063/1.461027] [Citation(s) in RCA: 28] [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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39
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Driessen JP, Somers LM, Beijerinck HC, Verhaar BJ. Autoionization widths for Ne*(3s)-Ar and Ne**(3p)-Ar collisions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:167-185. [PMID: 9905667 DOI: 10.1103/physreva.44.167] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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40
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Aguilar A, Bianco S, Brunetti B, González M, Vecchiocattivi F. Total cross-section for the ionization of molecules by thermal-energy collision with metastable neon atoms. Mol Phys 1990. [DOI: 10.1080/00268979000102191] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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41
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Driessen JP, Zonneveld MJ, Somers LM, Janssens MF, Beijerinck HC, Verhaar BJ. Polarization effects in the ionization cross section of Ar, Kr, and Xe by laser-excited Ne**. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:4058-4076. [PMID: 9904508 DOI: 10.1103/physreva.42.4058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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42
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Kucal H, Hennecart D, Masnou-Seeuws F. Model potential methods for the treatment of collisions between an excited rare gas and a ground state rare gas: Accuracy and limitations. Chem Phys 1990. [DOI: 10.1016/0301-0104(90)89113-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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43
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Beijerinck HC, Verhaar BJ. Preface. Chem Phys 1990. [DOI: 10.1016/0301-0104(90)89111-3] [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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44
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Vredenbregt E, Boom W, van Gerwen R, Beijerinck H. Excitation transfer collisions of metastable Ar*, Kr* and Xe* atoms with N2 (X, ν = 0 ): collision energy dependence of excitation cross sections and product vibrational distribution of N2(C 3Πu, ν′ = 0, 1, 2, 3). Chem Phys 1990. [DOI: 10.1016/0301-0104(90)89120-f] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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45
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Spiegelmann F, Gadea F, Castex M. Theoretical study of the electronic structure of the ArKr* exciplex. Chem Phys 1990. [DOI: 10.1016/0301-0104(90)89114-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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46
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Martin DW, Fukuyama T, Siska PE. Multichannel analysis of He*(21S)+Ne elastic and inelastic scattering in crossed atomic beams. J Chem Phys 1990. [DOI: 10.1063/1.458367] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Aquilanti V, Candori R, Pirani F, Krümpelmann T, Ottinger C. On the interaction potentials for the electronic energy transfer reactions Xe(3P0,2)+N2(X)→Xe(1S0)+N2(B 3Πg). Chem Phys 1990. [DOI: 10.1016/0301-0104(90)89067-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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48
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Fukuyama T, Siska PE. A curve‐crossing model for He*(23S)+Ne collisions consistent with differential and total scattering cross sections, and quenching rate constants. J Chem Phys 1989. [DOI: 10.1063/1.456241] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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49
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Driessen JP, Zonneveld MJ, Somers LM, Janssens MF, Beijerinck HC, Verhaar BJ. Polarization effects in the ionization cross section for collisions of Ne. PHYSICAL REVIEW LETTERS 1989; 62:2369-2372. [PMID: 10039968 DOI: 10.1103/physrevlett.62.2369] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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50
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Kraft T, Bregel T, Ganz J, Harth K, Ruf MW, Hotop H. Accurate comparison of Hel, NeI photoionization and He(23, 1 S), Ne(3s 3 P s,3 P 0) penning ionization of argon atoms and dimers. ACTA ACUST UNITED AC 1988. [DOI: 10.1007/bf01425766] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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