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Davis D, Kundu S, Prabhudesai VS, Sajeev Y, Krishnakumar E. Formation of CO2 from formic acid through catalytic electron channel. J Chem Phys 2018; 149:064308. [DOI: 10.1063/1.5032172] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- Daly Davis
- Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - Sramana Kundu
- Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - Vaibhav S. Prabhudesai
- Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - Y. Sajeev
- Theoretical Chemistry, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - E. Krishnakumar
- Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
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Herbert JM. The Quantum Chemistry of Loosely-Bound Electrons. REVIEWS IN COMPUTATIONAL CHEMISTRY 2015. [DOI: 10.1002/9781118889886.ch8] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Almeida D, Ferreira da Silva F, García G, Limão-Vieira P. Selective bond cleavage in potassium collisions with pyrimidine bases of DNA. PHYSICAL REVIEW LETTERS 2013; 110:023201. [PMID: 23383904 DOI: 10.1103/physrevlett.110.023201] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Indexed: 06/01/2023]
Abstract
Electron transfer in alkali-molecule collisions to gas phase thymine and uracil yielding H- formation is selectively controlled in the energy range between 5.3 and 66.1 eV. By tuning the collision energy, electron transfer from the alkali to partly deuterated thymine, methylated thymine at the N1 and methylated uracil at the N3 positions, H- loss proceeds not only through the breaking of the (C-H) against (N-H) bonds but also through N1 against N3 sites. Such selectivity, as far as bond and site are concerned, is here reported for the first time by electron transfer induced dissociation experiments in alkali-molecule collisions.
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Affiliation(s)
- Diogo Almeida
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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Orzol M, König-Lehmann C, Illenberger E, Kopyra J. Electron induced reactions in molecular nanofilms of chlorodifluoroacetic acid (CClF2COOH): Desorption of fragment anions and formation of CO2. J Chem Phys 2010; 133:194503. [DOI: 10.1063/1.3505550] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Sedlacko T, Balog R, Lafosse A, Stano M, Matejcik S, Azria R, Illenberger E. Reactions in condensed formic acid (HCOOH) induced by low energy (< 20 eV) electrons. Phys Chem Chem Phys 2009; 7:1277-82. [PMID: 19791345 DOI: 10.1039/b419104h] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The interaction of low energy (< 20 eV) electrons with a five monolayer (ML) film of formic acid (HCOOH) deposited on a cryogenically cooled monocrystalline Au substrate is studied by electron stimulated desorption (ESD) of negatively charged fragment ions. A comparison with results from gas phase experiments demonstrates the strong effect of the environment for negative ion formation via dissociative electron attachment (DEA). From condensed phase formic acid (FA) a strong H desorption signal from a resonant feature peaking at 9 eV is observed. In the gas phase, the dominant reaction is neutral hydrogen abstraction generating HCOO- within a low energy resonance, peaking at 1.25 eV. ESD studies on the isotopomers HCOOD and DCOOH indicate effective H/D exchange in the precursor ion at 9 eV prior to dissociation. The evolution of the desorption signals in the course of electron irradiation and the features in the thermal desorption spectra (TDS) of the electron irradiated film suggest the formation of CO2 at electron energies above 8 eV.
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Affiliation(s)
- Tibor Sedlacko
- Institut für Chemie-Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany
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Bertin M, Meyer M, Stähler J, Gahl C, Wolf M, Bovensiepen U. Reactivity of water–electron complexes on crystalline ice surfaces. Faraday Discuss 2009; 141:293-307; discussion 309-46. [DOI: 10.1039/b805198d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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8
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Bertin M, Martin I, Duvernay F, Theule P, Bossa JB, Borget F, Illenberger E, Lafosse A, Chiavassa T, Azria R. Chemistry induced by low-energy electrons in condensed multilayers of ammonia and carbon dioxide. Phys Chem Chem Phys 2009; 11:1838-45. [DOI: 10.1039/b812796d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kaneyasu T, Hikosaka Y, Lablanquie P, Penent F, Andric L, Gamblin G, Eland JHD, Tamenori Y, Matsushita T, Shigemasa E. Mechanisms of spontaneous two-electron emission from core-excited states of molecular CO. PHYSICAL REVIEW LETTERS 2008; 101:183003. [PMID: 18999827 DOI: 10.1103/physrevlett.101.183003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2008] [Indexed: 05/27/2023]
Abstract
We demonstrate that the observation of slow electrons emitted in the decay of molecular core-excited states can be a sensitive probe of the double Auger processes, and that in combination with electron-electron coincidence spectroscopy, it can provide clear insight into the mechanisms involved. The present study identifies all cascade Auger paths from the C1s-to-Rydberg states in CO to final states of CO2+. One pathway includes the first directly identified case of molecular level-to-level autoionization of a cation and shows remarkable selectivity for a specific final state.
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Affiliation(s)
- T Kaneyasu
- UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
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Krishnakumar E, Prabhudesai VS, Ram NB. Controlling molecular fragmentation using low energy electrons. ACTA ACUST UNITED AC 2007. [DOI: 10.1088/1742-6596/88/1/012073] [Citation(s) in RCA: 6] [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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11
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Lafosse A, Bertin M, Domaracka A, Pliszka D, Illenberger E, Azria R. Reactivity induced at 25 K by low-energy electron irradiation of condensed NH3-CH3COOD (1 : 1) mixture. Phys Chem Chem Phys 2006; 8:5564-8. [PMID: 17136271 DOI: 10.1039/b613479c] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Chemical reactivity is observed following electron irradiation of a binary mixture of ammonia (NH(3)) and acetic acid (CH(3)COOD) at 25 K, without any subsequent thermal activation, as evidenced by vibrational high resolution electron energy loss spectroscopy (HREELS). Analysis of the HREEL spectra and comparison with infrared and Raman data of different molecules are compatible with glycine formation in its zwitterionic form. The onset for electron induced reaction is found to be at about approximately 13 eV. The mechanisms may involve NH radicals interaction with CH(3)COOD molecules. Then glycine formation does not imply any displacement of reactants, so that it involves only NH(3) and CH(3)COOD neighboring molecules.
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Affiliation(s)
- Anne Lafosse
- Laboratoire des Collisions Atomiques et Moléculaires CNRS-Université Paris-Sud UMR 8625, FR LUMAT, bât. 351, Université Paris-Sud, 91405 Orsay Cedex, France
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Jäggle C, Swiderek P, Breton SP, Michaud M, Sanche L. Products and Reaction Sequences in Tetrahydrofuran Exposed to Low-Energy Electrons. J Phys Chem B 2006; 110:12512-22. [PMID: 16800580 DOI: 10.1021/jp0614291] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Electron-stimulated reactions in solid films of tetrahydrofuran (THF), condensed on Kr spacers deposited on a Pt substrate, or directly onto the substrate, were induced and monitored simultaneously with use of high-resolution electron-energy-loss spectroscopy in the ranges of vibrational and electronic excitations. The spectra of the molecular films obtained after a certain time of exposure to electrons at incident energies of 14 and 15.5 eV were analyzed and different products were identified. Besides an aldehyde, which is the main product, olefins, conjugated olefins, as well as CO were identified. Closer investigation of the reactions of propionaldehyde, as a model aldehyde, demonstrates that CO appears in THF as a secondary product (i.e., from the intermediate aldehyde). On the basis of the cross sections for the formation of an aldehyde from THF, of CO from propionaldehyde, and for the loss of propionaldehyde under electron impact, the reaction sequences were evaluated with the help of a kinetic model. This analysis suggests that some CO could also be formed directly from THF (i.e., without involvement of an intermediate aldehyde).
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Affiliation(s)
- Claudia Jäggle
- Universität Bremen, Fachbereich 2 (Chemie/Biologie), Leobener Strasse/NW 2, Postfach 330440, 28334 Bremen, Germany
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Prabhudesai VS, Kelkar AH, Nandi D, Krishnakumar E. Functional group dependent site specific fragmentation of molecules by low energy electrons. PHYSICAL REVIEW LETTERS 2005; 95:143202. [PMID: 16241651 DOI: 10.1103/physrevlett.95.143202] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2005] [Indexed: 05/05/2023]
Abstract
Functional group dependence is observed in the dissociative electron attachment (DEA) to various organic molecules in which the DEA features seen in the precursor molecules of the groups are retained in the bigger molecules. This functional group dependence is seen to lead to site-selective fragmentation of these molecules at the hydrogen sites. The results are explained in terms of the formation of core-excited Feshbach resonances. The results point to a simple way of controlling chemical reactions as well as interpreting the DEA data from bigger biological molecules.
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Ziesel JP, Jones NC, Field D, Madsen LB. The determination of absolute anion formation cross sections from electron beam scattering data. J Chem Phys 2005; 122:024309. [PMID: 15638588 DOI: 10.1063/1.1829054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using recent low energy electron scattering data for CCl4 and SF6, and accompanying theory illustrating the coupling of attachment and elastic scattering, absolute cross sections are derived for electron attachment to CCl4 and SF6 between impact energies, respectively, of 8-52 meV and 7-42 meV. Values of attachment cross sections are compared with those obtained by laser and threshold photoionization techniques, which include normalization to rate coefficient data. Excellent agreement with the latest CCl4 data is obtained, with less precise agreement for SF6, but still lying within experimental uncertainties.
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Affiliation(s)
- J-P Ziesel
- Laboratoire Collisions, Agrégats, Réactivité (CNRS UMR 5589), Université Paul Sabatier, 31062 Toulouse, France
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Tonzani S, Greene CH. Electron–molecule scattering calculations in a 3D finite element R-matrix approach. J Chem Phys 2005; 122:14111. [PMID: 15638646 DOI: 10.1063/1.1829056] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
We have implemented a three-dimensional finite element approach, based on tricubic polynomials in spherical coordinates, which solves the Schrodinger equation for scattering of a low energy electron from a molecule, approximating the electron exchange as a local potential. The potential is treated as a sum of three terms: electrostatic, exchange, and polarization. The electrostatic term can be extracted directly from ab initio codes (GAUSSIAN 98 in the work described here), while the exchange term is approximated using different local density functionals. A local polarization potential approximately describes the long range attraction to the molecular target induced by the scattering electron.
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