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Med J, Sršeň Š, Slavíček P, Domaracka A, Indrajith S, Rousseau P, Fárník M, Fedor J, Kočišek J. Vibrationally Mediated Stabilization of Electrons in Nonpolar Matter. J Phys Chem Lett 2020; 11:2482-2489. [PMID: 32154726 DOI: 10.1021/acs.jpclett.0c00278] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We explore solvation of electrons in nonpolar matter, here represented by butadiene clusters. Isolated butadiene supports only the existence of transient anions (resonances). Two-dimensional electron energy loss spectroscopy shows that the resonances lead to an efficient vibrational excitation of butadiene, which can result into the almost complete loss of energy of the interacting electron. Cluster-beam experiments show that molecular clusters of butadiene form stable anions, however only at sizes of more than 9 molecular units. We have calculated the distribution of electron affinities of clusters using classical and path integral molecular dynamics simulations. There is almost a continuous transition from the resonant to the bound anions with an increase in cluster size. The comparison of the classical and quantum dynamics reveals that the electron binding is strongly supported by molecular vibrations, brought about by nuclear zero-point motion and thermal agitation. We also inspected the structure of the solvated electron, finding it well localized.
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Affiliation(s)
- Jakub Med
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 16628 Prague 6, Czech Republic
| | - Štěpán Sršeň
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 16628 Prague 6, Czech Republic
| | - Petr Slavíček
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 16628 Prague 6, Czech Republic
- J. Heyrovský Institute of Physical Chemistry v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - A Domaracka
- Normandie Univ., ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France
| | - S Indrajith
- Normandie Univ., ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France
| | - P Rousseau
- Normandie Univ., ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France
| | - M Fárník
- J. Heyrovský Institute of Physical Chemistry v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - J Fedor
- J. Heyrovský Institute of Physical Chemistry v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - J Kočišek
- J. Heyrovský Institute of Physical Chemistry v.v.i., The Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
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Shen BB, Lunny KG, Benitez Y, Continetti RE. Photoelectron-Photofragment Coincidence Spectroscopy With Ions Prepared in a Cryogenic Octopole Accumulation Trap: Collisional Excitation and Buffer Gas Cooling. Front Chem 2019; 7:295. [PMID: 31114785 PMCID: PMC6503059 DOI: 10.3389/fchem.2019.00295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 04/10/2019] [Indexed: 11/17/2022] Open
Abstract
A cryogenic octopole accumulation trap (COAT) has been coupled to a photoelectron-photofragment coincidence (PPC) spectrometer allowing for improved control over anion vibrational excitation. The anions are heated and cooled via collisions with buffer gas <17 K. Shorter trapping times (500 μs) prevent thermalization and result in anions with high internal excitation while longer trapping times (80 ms) at cryogenic temperatures thermalize the ions to the temperature of the buffer gas. The capabilities of the COAT are demonstrated using PPC spectroscopy ofO 3 - at 388 nm (Ehν = 3.20 eV). Cooling the precursor anions with COAT resulted in the elimination of the autodetachment of vibrationally excitedO 2 - produced by the photodissociationO 3 - + hν → O +O 2 - (v ≥ 4). Under heating conditions, a lower limit temperature for the anions was determined to be 1,500 K through Franck-Condon simulations of the photodetachment spectrum ofO 3 - , considering a significant fraction of the ions undergo photodissociation in competition with photodetachment. The ability to cool or heat ions by varying ion injection and trapping duration in COAT provides a new flexibility for studying the spectroscopy of cold ions as well as thermally activated processes.
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Affiliation(s)
| | | | | | - Robert E. Continetti
- Department of Chemistry and Biochemistry, University of California, San Diego, San Diego, CA, United States
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DeVine JA, Weichman ML, Xie C, Babin MC, Johnson MA, Ma J, Guo H, Neumark DM. Autodetachment from Vibrationally Excited Vinylidene Anions. J Phys Chem Lett 2018; 9:1058-1063. [PMID: 29438618 DOI: 10.1021/acs.jpclett.8b00144] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Slow electron velocity-map imaging of the cryogenically cooled H2CC¯ anion reveals a strong dependence of its high-resolution photoelectron spectrum on detachment photon energy in two specific ranges, from 4000 to 4125 cm-1 and near 5020 cm-1. This effect is attributed to vibrational excitation of the anion followed by autodetachment to H2CC + e¯. In the lower energy range, the electron kinetic energy (eKE) distributions are dominated by two features that occur at constant eKEs of 114(3) and 151.9(14) cm-1 rather than constant electron binding energies, as is typically seen for direct photodetachment. These features are attributed to ΔJ = ΔK = 0 autodetachment transitions from two vibrationally excited anion states. The higher energy resonance autodetaches to neutral eigenstates with amplitude in the theoretically predicted shallow well lying along the vinylidene-acetylene isomerization coordinate. Calculations provide assignments of all autodetaching anion states and show that the observed autodetachment is facilitated by an intersection of the anion and neutral surfaces.
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Affiliation(s)
- Jessalyn A DeVine
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Marissa L Weichman
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Changjian Xie
- Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Mark C Babin
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Mark A Johnson
- Sterling Chemistry Laboratory, Yale University , New Haven, Connecticut 06520, United States
| | - Jianyi Ma
- Institute of Atomic and Molecular Physics, Sichuan University , Chengdu, Sichuan 610065, China
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Daniel M Neumark
- Department of Chemistry, University of California , Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
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Sailer W, Pelc A, Limão-Vieira P, Mason N, Limtrakul J, Scheier P, Probst M, Märk T. Low energy electron attachment to CH3CN. Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.09.118] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Matt S, Parajuli R, Stamatovic A, Scheier P, Märk TD. Quantitative investigation of the kinetic energy release in metastable decay reactions of (O2)n=2–10+ ions: Evidence for a change in the metastable decay mechanism as a function of cluster size. J Chem Phys 2002. [DOI: 10.1063/1.1465414] [Citation(s) in RCA: 8] [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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Sailer W, Drexel H, Pelc A, Grill V, Mason N, Illenberger E, Skalny J, Mikoviny T, Scheier P, Märk T. Low energy electron attachment to SF5CF3. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(01)01367-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sailer W, Tegeder P, Probst M, Drexel H, Grill V, Scheier P, Mason NJ, Illenberger E, Märk TD. Dissociation pathways in low energy (0–2 eV) electron attachment to Cl2O. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00814-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Matejcik S, Stampfli P, Stamatovic A, Scheier P, Märk TD. Electron attachment to oxygen clusters studied with high energy resolution. J Chem Phys 1999. [DOI: 10.1063/1.479637] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kreil J, Ruf MW, Hotop H, Ettischer I, Buck U. Threshold electron attachment and electron impact ionization involving oxygen dimers. Chem Phys 1998. [DOI: 10.1016/s0301-0104(98)00254-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Muigg D, Denifl G, Stamatovic A, Echt O, Märk T. High-resolution electron ionization study of CO, (CO)2 and (CO)3: appearance energies and bond dissociation energies. Chem Phys 1998. [DOI: 10.1016/s0301-0104(98)00298-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Thoss M, Domcke W. Theory of vibrational relaxation processes in resonant collisions of low-energy electrons with large molecules. J Chem Phys 1998. [DOI: 10.1063/1.477310] [Citation(s) in RCA: 36] [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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Chu Y, Senn G, Matejcik S, Scheier P, Stampfli P, Stamatovic A, Illenberger E, Märk TD. Formation of NO− following electron attachment to NO clusters. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)00420-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ruckhaberle N, Lehmann L, Matejcik S, Illenberger E, Bouteiller Y, Periquet V, Museur L, Desfrançois C, Schermann JP. Free Electron Attachment and Rydberg Electron Transfer to NF3Molecules and Clusters. J Phys Chem A 1997. [DOI: 10.1021/jp972422+] [Citation(s) in RCA: 31] [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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A coordinated flowing afterglow and crossed beam study of electron attachment to CCl3Br. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0168-1176(97)00028-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Matejcik S, Cicman P, Kiendler A, Senn G, Illenberger E, Märk TD. Electron transfer processes in binary van der Waals clusters via the N2−(2Πg) resonance. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)00113-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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