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Barillot T, Brédy R, Celep G, Cohen S, Compagnon I, Concina B, Constant E, Danakas S, Kalaitzis P, Karras G, Lépine F, Loriot V, Marciniak A, Predelus-Renois G, Schindler B, Bordas C. Influence of long-range Coulomb interaction in velocity map imaging. J Chem Phys 2017; 147:013929. [PMID: 28688435 DOI: 10.1063/1.4982616] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The standard velocity-map imaging (VMI) analysis relies on the simple approximation that the residual Coulomb field experienced by the photoelectron ejected from a neutral or ion system may be neglected. Under this almost universal approximation, the photoelectrons follow ballistic (parabolic) trajectories in the externally applied electric field, and the recorded image may be considered as a 2D projection of the initial photoelectron velocity distribution. There are, however, several circumstances where this approximation is not justified and the influence of long-range forces must absolutely be taken into account for the interpretation and analysis of the recorded images. The aim of this paper is to illustrate this influence by discussing two different situations involving isolated atoms or molecules where the analysis of experimental images cannot be performed without considering long-range Coulomb interactions. The first situation occurs when slow (meV) photoelectrons are photoionized from a neutral system and strongly interact with the attractive Coulomb potential of the residual ion. The result of this interaction is the formation of a more complex structure in the image, as well as the appearance of an intense glory at the center of the image. The second situation, observed also at low energy, occurs in the photodetachment from a multiply charged anion and it is characterized by the presence of a long-range repulsive potential. Then, while the standard VMI approximation is still valid, the very specific features exhibited by the recorded images can be explained only by taking into consideration tunnel detachment through the repulsive Coulomb barrier.
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Affiliation(s)
- T Barillot
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - R Brédy
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - G Celep
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - S Cohen
- Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, 45110 Ioannina, Greece
| | - I Compagnon
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - B Concina
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - E Constant
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - S Danakas
- Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, 45110 Ioannina, Greece
| | - P Kalaitzis
- Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, 45110 Ioannina, Greece
| | - G Karras
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - F Lépine
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - V Loriot
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - A Marciniak
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - G Predelus-Renois
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - B Schindler
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - C Bordas
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
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Concina B, Lépine F, Bordas C. A detailed-balance model for thermionic emission from polyanions: The case of fullerene dianions. J Chem Phys 2017; 146:224311. [PMID: 29166075 DOI: 10.1063/1.4985609] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A detailed-balance model for thermionic emission from polyanions has been developed and applied to fullerene dianions. The specificity of this delayed decay process is electron tunneling through the repulsive Coulomb barrier (RCB). An analytical expression of the RCB is derived from electrostatic modeling of the fullerene cage. The reverse process, namely, electron attachment to the singly charged anion, is described by a hard sphere cross section weighted by the Wentzel-Kramers-Brillouin tunneling probability. This simple expression leads to a very good agreement with a measured time-resolved kinetic energy distribution of C842-. Electron binding energy is reduced when the fullerene cage size decreases, leading to an almost zero one for C702- and a negative one for C602-. Extension of the model to these systems of interest is discussed, and model outputs are compared with the experimental data from the literature.
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Affiliation(s)
- Bruno Concina
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - Franck Lépine
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - Christian Bordas
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
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3
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Wang LS. Perspective: Electrospray photoelectron spectroscopy: From multiply-charged anions to ultracold anions. J Chem Phys 2015; 143:040901. [DOI: 10.1063/1.4927086] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Lai-Sheng Wang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
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Sen A, Dessent CEH. Communication: Photoactivation of nucleobase bound platinumIImetal complexes: Probing the influence of the nucleobase. J Chem Phys 2014; 141:241101. [DOI: 10.1063/1.4904259] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
- Ananya Sen
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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Verlet JRR, Horke DA, Chatterley AS. Excited states of multiply-charged anions probed by photoelectron imaging: riding the repulsive Coulomb barrier. Phys Chem Chem Phys 2014; 16:15043-52. [DOI: 10.1039/c4cp01667j] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recent progress towards understanding the repulsive Coulomb barrier in multiply-charged anion using photoelectron spectroscopy is discussed.
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Affiliation(s)
| | - Daniel A. Horke
- Center for Free-Electron Laser Science
- DESY
- 22607 Hamburg, Germany
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6
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Kaufman SH, Weber JM, Pernpointner M. Electronic structure and UV spectrum of hexachloroplatinate dianions in vacuo. J Chem Phys 2013; 139:194310. [DOI: 10.1063/1.4830407] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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7
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Marcum JC, Krylov AI, Weber JM. Spectroscopy and fragmentation of undercoordinated bromoiridates. J Phys Chem A 2011; 115:13482-8. [PMID: 21988607 DOI: 10.1021/jp208933z] [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
We report gas-phase electronic photodissociation spectra of the undercoordinated bromoiridate complexes IrBr(4)(-) and IrBr(5)(-) at photon energies from 1 to 5.6 eV. Both ions have open-shell ground states with low-symmetry structures. The fragmentation is characterized by thresholds for the loss of one Br atom for IrBr(4)(-) and one or two Br atoms for IrBr(5)(-). The experimental spectra consist of ligand-to-metal charge transfer transitions and reveal a large density of electronic states that can be recovered by time-dependent density functional theory.
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Affiliation(s)
- Jesse C Marcum
- JILA , NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
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Hansen CN, Kirketerp MBS, Kristensen MB, Nielsen SB, Støchkel K, Wyer JA. On the stability of isolated Pt(SCN)42- dianions in vacuo and action spectroscopy experiments. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2010.12.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Milner EM, Nix MGD, Dessent CEH. Evidence for hydrogen bond network formation in microsolvated clusters of Pt(CN)42−: collision induced dissociation studies of Pt(CN)42−·(H2O)nn = 1–4, and Pt(CN)42−·(MeCN)mm = 1, 2 cluster ions. Phys Chem Chem Phys 2011; 13:18379-85. [DOI: 10.1039/c1cp21538h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Affiliation(s)
- Xue-Bin Wang
- Department of Physics, Washington State University, Richland, Washington 99354, and Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352;
| | - Lai-Sheng Wang
- Department of Physics, Washington State University, Richland, Washington 99354, and Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352;
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Marcum JC, Weber JM. Electronic photodissociation spectra and decay pathways of gas-phase IrBr[sub 6]2−]. J Chem Phys 2009; 131:194309. [DOI: 10.1063/1.3265956] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Concina B, Neumaier M, Hampe O, Kappes MM. Electron emission from laser-heated fullerene dianions: Probing the repulsive Coulomb barrier. J Chem Phys 2008; 128:134306. [DOI: 10.1063/1.2842145] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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On the propensity for electron transfer in high-energy collisions of iridium complex anions with cesium atoms. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.05.081] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Gabelica V, Rosu F, Tabarin T, Kinet C, Antoine R, Broyer M, De Pauw E, Dugourd P. Base-dependent electron photodetachment from negatively charged DNA strands upon 260-nm laser irradiation. J Am Chem Soc 2007; 129:4706-13. [PMID: 17378565 DOI: 10.1021/ja068440z] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
DNA multiply charged anions stored in a quadrupole ion trap undergo one-photon electron ejection (oxidation) when subjected to laser irradiation at 260 nm (4.77 eV). Electron photodetachment is likely a fast process, given that photodetachment is able to compete with internal conversion or radiative relaxation to the ground state. The DNA [6-mer]3- ions studied here show a marked sequence dependence of electron photodetachment yield. Remarkably, the photodetachment yield (dG6 > dA6 > dC6 > dT6) is inversely correlated with the base ionization potentials (G < A < C < T). Sequences with guanine runs show increased photodetachment yield as the number of guanine increases, in line with the fact that positive holes are the most stable in guanine runs. This correlation between photodetachment yield and the stability of the base radical may be explained by tunneling of the electron through the repulsive Coulomb barrier. Theoretical calculations on dinucleotide monophosphates show that the HOMO and HOMO-1 orbitals are localized on the bases. The wavelength dependence of electron detachment yield was studied for dG63-. Maximum electron photodetachment is observed in the wavelength range corresponding to base absorption (260-270 nm). This demonstrates the feasibility of gas-phase UV spectroscopy on large DNA anions. The calculations and the wavelength dependence suggest that the electron photodetachment is initiated at the bases and not at the phosphates. This also indicates that, although direct photodetachment could also occur, autodetachment from excited states, presumably corresponding to base excitation, is the dominant process at 260 nm. Excited-state dynamics of large DNA strands still remains largely unexplored, and photo-oxidation studies on trapped DNA multiply charged anions can help in bridging the gap between gas-phase studies on isolated bases or base pairs and solution-phase studies on full DNA strands.
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Affiliation(s)
- Valérie Gabelica
- Laboratoire de Spectrométrie de Masse, Université de Liège, Institut de Chimie Bat B6c, B-4000 Liège, Belgium.
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Wang XB, Wang YL, Woo HK, Li J, Wu GS, Wang LS. Free tetra- and hexa-coordinated platinum-cyanide dianions, and : A combined photodetachment photoelectron spectroscopic and theoretical study. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2006.07.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Boxford WE, Dessent CEH. Probing the intrinsic features and environmental stabilization of multiply charged anions. Phys Chem Chem Phys 2006; 8:5151-65. [PMID: 17203139 DOI: 10.1039/b609123g] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Multiply charged anions (MCAs) represent exotic, highly energetic species in the gas-phase due to their propensity to undergo unimolecular decay via electron loss or ionic fragmentation. There is considerable fundamental interest in these systems since they display novel potential energy surfaces that are characterized by Coulomb barriers. Over recent years, considerable progress has been made in understanding the factors that affect the stability, decay pathways and reactivity of gas-phase MCAs, mainly as a result of the application of electrospray ionization as a generic technique for transferring solution-phase MCAs into the gas-phase for detailed characterization. We review contemporary work in this field, focusing on the factors that control the intrinsic stability of MCAs, both as isolated gas-phase ions, and on their complexation with solvent molecules and counter-ions. While studies of MCAs are primarily of fundamental interest, several classes of important biological ions are commonly observed as MCAs in the gas-phase (e.g. oligonucleotides, sugars). Recent results for biologically relevant ions are emphasised, since a fundamental understanding of the properties of gas-phase MCAs will be highly valuable for developing further analytical methods to study these important systems.
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