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Regeta K, Kumar S, Cunha T, Mendes M, Lozano AI, Pereira PJS, García G, Moutinho AMC, Bacchus-Montabonel MC, Limão-Vieira P. Combined Experimental and Theoretical Studies on Electron Transfer in Potassium Collisions with CCl 4. J Phys Chem A 2020; 124:3220-3227. [PMID: 32233369 DOI: 10.1021/acs.jpca.0c02076] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Negative ion formation in electron transfer experiments from fast neutral potassium (K) atom collisions with neutral tetrachloromethane (CCl4) molecules has been investigated in the laboratory frame range of 8-1000 eV. Comprehensive calculations on the electronic structure were performed for CCl4 in the presence of a potassium atom and used to help analyze the lowest unoccupied molecular orbitals participating in the collision process. Additionally, K+ energy loss produced in the forward direction has served to further our knowledge on the electronic state spectroscopy of CCl4. A vertical electron affinity of -0.79 ± 0.20 eV has been obtained and assigned to a purely repulsive transition from CCl4 ground state to the 2T2 state of the temporary negative ion yielding Cl- formation. Other features in the energy loss spectrum were observed for the first time and related to Cl2-, CCl2-, and CCl3- formation. Special attention is also given to the unresolved feature corresponding to a positive electron affinity of 0.24 ± 0.2 eV, assigned to a vibrationally hot transition from CCl4 ground state into the triply degenerate 2T2 excited state of the negative ion. The combined time-of-flight mass spectrometry together with K+ energy loss data represents the most comprehensive assignment of the tetrachloromethane anion yields and the role of CCl4 electronic states in collision induced dissociation to date.
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Affiliation(s)
- K Regeta
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - S Kumar
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - T Cunha
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - M Mendes
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - A I Lozano
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - P J S Pereira
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.,Department of Mathematics, Instituto Superior de Engenharia de Lisboa, R. Conselheiro Emídio Navarro 1, 1959-007 Lisboa, Portugal
| | - G García
- Instituto de Fı́sica Fundamental, Consejo Superior de Investigaciones Cientı́ficas (CSIC), Serrano 113-bis, 28006 Madrid, Spain
| | - A M C Moutinho
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - M-C Bacchus-Montabonel
- Institut Lumière Matière, CNRS, Université Claude Bernard Lyon 1, 69622 Villeurbanne, France
| | - P Limão-Vieira
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
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Song H, Dai D, Wu G, Wang CC, Harich SA, Hayes MY, Wang X, Gerlich D, Yang X, Skodje RT. Chemical reaction dynamics of Rydberg atoms with neutral molecules: A comparison of molecular-beam and classical trajectory results for the H(n)+D2→HD+D(n′) reaction. J Chem Phys 2005; 123:074314. [PMID: 16229577 DOI: 10.1063/1.1998807] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recent molecular-beam experiments have probed the dynamics of the Rydberg-atom reaction, H(n)+D2-->HD+D(n) at low collision energies. It was discovered that the rotationally resolved product distribution was remarkably similar to a much more limited data set obtained at a single scattering angle for the ion-molecule reaction H++D2-->D++HD. The equivalence of these two problems would be consistent with the Fermi-independent-collider model (electron acting as a spectator) and would provide an important new avenue for the study of ion-molecule reactions. In this work, we employ a classical trajectory calculation on the ion-molecule reaction to facilitate a more extensive comparison between the two systems. The trajectory simulations tend to confirm the equivalence of the ion+molecule dynamics to that for the Rydberg-atom+molecule system. The theory reproduces the close relationship of the two experimental observations made previously. However, some differences between the Rydberg-atom experiments and the trajectory simulations are seen when comparisons are made to a broader data set. In particular, the angular distribution of the differential cross section exhibits more asymmetry in the experiment than in the theory. The potential breakdown of the classical model is discussed. The role of the "spectator" Rydberg electron is addressed and several crucial issues for future theoretical work are brought out.
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Affiliation(s)
- Hui Song
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, People's Republic of China
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Liu Y, Suess L, Dunning FB. Rydberg electron transfer to SF6: Product ion lifetimes. J Chem Phys 2005; 122:214313. [PMID: 15974744 DOI: 10.1063/1.1925276] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The lifetimes of SF6- ions produced by Rydberg electron transfer in K(np)SF6 collisions at high n, n greater or similar to 30, are examined using a Penning ion trap. The data point to the formation of ions with a range of lifetimes that extends from approximately 1 to greater or similar to 10 ms. Sizable numbers of ions remain in the trap even 40 ms after initial injection and at least part of this signal can be attributed to radiative stabilization. Measurements of free low-energy electron attachment to SF6 in the trap show that the product ions have lifetimes similar to those of SF6- ions formed by electron transfer in high-n collisions.
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Affiliation(s)
- Y Liu
- Department of Physics and Astronomy and the Rice Quantum Institute, MS 61 Rice University, 6100 Main Street, Houston, Texas 77005-1892, USA
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Nakagawa S. Negative chemical ionization mass spectrometric study on the electron attachment to CFxCl4−x(x=1,2) and CBryCl4−y(y=1,2). Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00634-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nakagawa S, Shimokawa T. Negative Chemical Ionization Mass Spectrometric Study on the Dissociative Electron Attachment Process of Chlorofluorocarbons and Bromofluorocarbons. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1999. [DOI: 10.1246/bcsj.72.2211] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hessler JP. New empirical rate expression for reactions without a barrier: Analysis of the reaction of CN with O2. J Chem Phys 1999. [DOI: 10.1063/1.479183] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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Matejcik S, Senn G, Scheier P, Kiendler A, Stamatovic A, Märk TD. Dissociative electron attachment cross section to CHCl3 using a high resolution crossed beams technique. J Chem Phys 1997. [DOI: 10.1063/1.475187] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S. Matejcik
- Institut für Ionenphysik, Universität Innsbruck, Technikerstr.25, A-6020 Innsbruck, Austria
| | - G. Senn
- Institut für Ionenphysik, Universität Innsbruck, Technikerstr.25, A-6020 Innsbruck, Austria
| | - P. Scheier
- Institut für Ionenphysik, Universität Innsbruck, Technikerstr.25, A-6020 Innsbruck, Austria
| | - A. Kiendler
- Institut für Ionenphysik, Universität Innsbruck, Technikerstr.25, A-6020 Innsbruck, Austria
| | - A. Stamatovic
- Institut für Ionenphysik, Universität Innsbruck, Technikerstr.25, A-6020 Innsbruck, Austria
| | - T. D. Märk
- Institut für Ionenphysik, Universität Innsbruck, Technikerstr.25, A-6020 Innsbruck, Austria
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Hill SB, Frey MT, Dunning FB, Fabrikant II. Electron-hydrogen fluoride scattering at ultralow electron energies: Possible role of dipole-supported states. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 53:3348-3357. [PMID: 9913279 DOI: 10.1103/physreva.53.3348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Matejcik S, Kiendler A, Stamatovic A, Märk T. A crossed beam high resolution study of dissociative electron attachment to CCl4. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0168-1176(95)04265-m] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Frey MT, Hill SB, Smith KA, Dunning FB, Fabrikant II. Studies of electron-molecule scattering at microelectronvolt energies using very-high-n Rydberg atoms. PHYSICAL REVIEW LETTERS 1995; 75:810-813. [PMID: 10060124 DOI: 10.1103/physrevlett.75.810] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Klar D, Mirbach B, Korsch HJ, Ruf MW, Hotop H. Comparison of rate coefficients for rydberg electron and free electron attachment. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf01445001] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Frey MT, Hill SB, Ling X, Smith KA, Dunning FB, Fabrikant II. Inelastic electron-dipole-molecule scattering at sub-milli-electron-volt energies: Possible role of dipole-supported states. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:3124-3128. [PMID: 9911253 DOI: 10.1103/physreva.50.3124] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Carman HS, Klots CE, Compton RN. Rydberg electron transfer to hydrogen iodide: Dissociative and nondissociative electron capture. J Chem Phys 1993. [DOI: 10.1063/1.465290] [Citation(s) in RCA: 17] [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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Ling X, Frey MT, Smith KA, Dunning FB. Inelastic electron-dipole-molecule scattering at sub-milli-electron-volt energies: HF and NH3. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 48:1252-1256. [PMID: 9909729 DOI: 10.1103/physreva.48.1252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Chupka WA. Factors affecting lifetimes and resolution of Rydberg states observed in zero‐electron‐kinetic‐energy spectroscopy. J Chem Phys 1993. [DOI: 10.1063/1.465011] [Citation(s) in RCA: 418] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ling X, Frey MT, Smith KA, Dunning FB. The role of inversion transitions in K(150p)/NH3, ND3 collisions. J Chem Phys 1993. [DOI: 10.1063/1.464181] [Citation(s) in RCA: 7] [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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Ling X, Smith KA, Dunning FB. Inelastic electron-dipole-molecule scattering at sub-milli-electron-volt energies: CH3I and CH2Br2. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:R1-R4. [PMID: 9908981 DOI: 10.1103/physreva.47.r1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Shimamori H, Tatsumi Y, Ogawa Y, Sunagawa T. Low‐energy electron attachment to molecules studied by pulse‐radiolysis microwave‐cavity technique combined with microwave heating. J Chem Phys 1992. [DOI: 10.1063/1.463695] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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