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Gao Y, Zheng Y, Sanche L. Low-Energy Electron Damage to Condensed-Phase DNA and Its Constituents. Int J Mol Sci 2021; 22:7879. [PMID: 34360644 PMCID: PMC8345953 DOI: 10.3390/ijms22157879] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/30/2021] [Accepted: 06/30/2021] [Indexed: 11/18/2022] Open
Abstract
The complex physical and chemical reactions between the large number of low-energy (0-30 eV) electrons (LEEs) released by high energy radiation interacting with genetic material can lead to the formation of various DNA lesions such as crosslinks, single strand breaks, base modifications, and cleavage, as well as double strand breaks and other cluster damages. When crosslinks and cluster damages cannot be repaired by the cell, they can cause genetic loss of information, mutations, apoptosis, and promote genomic instability. Through the efforts of many research groups in the past two decades, the study of the interaction between LEEs and DNA under different experimental conditions has unveiled some of the main mechanisms responsible for these damages. In the present review, we focus on experimental investigations in the condensed phase that range from fundamental DNA constituents to oligonucleotides, synthetic duplex DNA, and bacterial (i.e., plasmid) DNA. These targets were irradiated either with LEEs from a monoenergetic-electron or photoelectron source, as sub-monolayer, monolayer, or multilayer films and within clusters or water solutions. Each type of experiment is briefly described, and the observed DNA damages are reported, along with the proposed mechanisms. Defining the role of LEEs within the sequence of events leading to radiobiological lesions contributes to our understanding of the action of radiation on living organisms, over a wide range of initial radiation energies. Applications of the interaction of LEEs with DNA to radiotherapy are briefly summarized.
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Affiliation(s)
- Yingxia Gao
- State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, China;
| | - Yi Zheng
- State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, China;
| | - Léon Sanche
- Département de Médecine Nucléaire et Radiobiologie et Centre de Recherche Clinique, Faculté de Médecine, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada;
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Ellis-Gibbings L, Bass AD, Cloutier P, García G, Sanche L. Electron stimulated desorption from condensed pyrimidine and pyridazine. Phys Chem Chem Phys 2018; 19:13038-13048. [PMID: 28484763 DOI: 10.1039/c7cp00715a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Low energy electron (LEE) interactions and the formation of transient negative ions play a dominant role in radiation-induced dissociation of condensed-phase biomolecules (e.g. in radiotherapy). Here we present data on the LEE-induced dissociation and desorption of the DNA/RNA-base and radiosensitizing agent analogues pyrimidine and pyridazine. Vapors of each molecule were condensed on either a Pt or Ar substrate to form a multilayer film or a submonolayer molecular target, respectively. These were irradiated with electrons of 0-80 eV and the desorbing anionic and cationic fragments analysed via time of flight mass spectrometry. The detected cations are the same species seen in gas-phase mass spectra, albeit of differing relative intensity. Anion yield functions exhibit strong maxima, indicating that transient negative ions contribute significantly, via dissociative electron attachment (DEA), to molecular dissociation below 20 eV. For both molecules, the <5 eV shape resonances, seen experimentally and predicted by theory, do not result in fragment desorption. The main anionic fragments are H- and CN- for both molecules, additionally the fragments C-, CH- C2H- and CHN- desorb from pyrimidine and C- and C2H- from pyridazine, with some resonances lying above the ionization limit. Pyrimidine shows higher anion desorption yields than pyridazine for all species except H-. The anion signal also comprises dipolar dissociation (DD), investigated in both anionic and cationic yield functions. From analysis of anion and cation yields, fragmentation pathways are suggested. The direct ionization pathway provides information on the appearance energies for cations and their production processes in condensed phase.
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Affiliation(s)
- L Ellis-Gibbings
- Fundamental Physics Institute, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain.
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Postler J, Vizcaino V, Denifl S, Zappa F, Ralser S, Daxner M, Illenberger E, Scheier P. Electron attachment to CO2 embedded in superfluid He droplets. J Phys Chem A 2014; 118:6553-9. [PMID: 24818738 PMCID: PMC4141896 DOI: 10.1021/jp503179d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
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Electron attachment to CO2 embedded in superfluid He
droplets leads to ionic complexes of the form (CO2)n– and (CO2)nO– and, at much lower intensities,
He containing ions of the form Hem(CO2)nO–. At low
energies (<5 eV), predominantly the non-decomposed complexes (CO2)n– are formed
via two resonance contributions, similar to electron attachment to
pristine CO2 clusters. The significantly different shapes
and relative resonance positions, however, indicate particular quenching
and mediation processes in CO2@He. A series of further
resonances in the energy range up to 67 eV can be assigned to electronic
excitation of He and capture of the inelastically scattered electron
generating (CO2)n– and two additional processes where an intermediately formed He*
leads to the nonstoichiometric anions (CO2)nO–.
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Affiliation(s)
- Johannes Postler
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck , Technikerstrasse 25, A-6020 Innsbruck, Austria
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Kočišek J, Lengyel J, Fárník M, Slavíček P. Energy and charge transfer in ionized argon coated water clusters. J Chem Phys 2013; 139:214308. [PMID: 24320381 DOI: 10.1063/1.4834715] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- J Kočišek
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
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Bazin M, Ptasińska S, Bass AD, Sanche L. Electron induced dissociation in condensed-phase nitromethane I: desorption of ionic fragments. Phys Chem Chem Phys 2009; 11:1610-8. [PMID: 19240939 DOI: 10.1039/b814219j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low energy electron induced dissociation of condensed nitromethane was investigated by measuring the electron stimulated desorption of anions and cations from multilayer films of CH(3)NO(2) and CD(3)NO(2), using a recently constructed, high sensitivity time of flight mass spectrometer. The desorbed yields were measured as a function of incident electron energy in the range between 1 to 20 eV and as function of coverage on Pt and Xe substrates. In anion desorption experiments, the following ions were observed: H(-) (D(-)), O(-), OH(-) (OD(-)), CN(-), NCO(-), NO(2)(-), CHNO(2)(-) (CDNO(2)(-)), CH(2)NO(2)(-) (CD(2)NO(2)(-)). Resonant structure seen in all anion yield functions, is attributed to dissociative electron attachment (DEA), though certain anion signals [e.g., OH(-) (OD(-)) and CH(2)NO(2)(-) (CD(2)NO(2)(-))] are likely the result of reactive scattering by O(-) ions. The dominant desorbed cation signals are CD(3)(+) and NO(+), and the appearance potentials of these species were measured to be 12.2 and 11.5 eV, respectively. The present measurements provide information on how the electron-induced dissociation processes of this proto-typical explosive molecule are modulated by the condensed environment and on how initial dissociation events occurring on a particular molecule, may induce further dissociation.
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Affiliation(s)
- Marc Bazin
- Département de médecine nucléaire et radiobiologie, Faculté de médecine, Université de Sherbrooke, Sherbrooke, QC, Canada,J1J 1R7
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Garand E, Moula MG, Rowntree PA. Localization vs conduction: anionic excitations in alkanethiol self-assembled monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:13850-13854. [PMID: 19360932 DOI: 10.1021/la803036v] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Low-energy (6-11 eV) electron injection into Xe-coated self-assembled alkanethiol monolayers (SAMs) is reported. At most energies, the presence of the Xe film has negligible effect on the incident electrons, which penetrate the overlayer and induce significant C--H bond rupture at the terminal methyl sites and the subsurface methylene sites of the organic substrates. However, irradiation at 7.7 +/- 0.2 eV can lead to resonant electronic excitations of the Xe adsorbates to create transient anionic states in the Xe overlayer. Transfer of anionic excitations from the Xe overlayer to the SAM initially prepares excited anionic states at the terminal CH3 groups and leads to highly selective dissociations at the methyl sites, with negligible conduction along the alkane chain which would lead to subsurface C-H bond rupture at the methylene sites. These results demonstrate that the mobility of electronically excited charged states along the alkanethiol chains is significantly less than that of simple excess electrons and that highly site-selective chemical modifications can be induced by low-energy electrons in these highly homogeneous organic films.
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Affiliation(s)
- Etienne Garand
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Zheng Y, Cloutier P, Hunting DJ, Wagner JR, Sanche L. Phosphodiester and N-glycosidic bond cleavage in DNA induced by 4-15 eV electrons. J Chem Phys 2007; 124:64710. [PMID: 16483232 DOI: 10.1063/1.2166364] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Thin molecular films of the short single strand of DNA, GCAT, were bombarded under vacuum by electrons with energies between 4 and 15 eV. Ex vacuo analysis by high-pressure liquid chromatography of the samples exposed to the electron beam revealed the formation of a multitude of products. Among these, 12 fragments of GCAT were identified by comparison with reference compounds and their yields were measured as a function of electron energy. For all energies, scission of the backbone gave nonmodified fragments containing a terminal phosphate, with negligible amounts of fragments without the phosphate group. This indicates that phosphodiester bond cleavage by 4-15 eV electrons involves cleavage of the C-O bond rather than the P-O bond. The yield functions exhibit maxima at 6 and 10-12 eV, which are interpreted as due to the formation of transient anions leading to fragmentation. Below 15 eV, these resonances dominate bond dissociation processes. All four nonmodified bases are released from the tetramer, by cleavage of the N-glycosidic bond, which occurs principally via the formation of core-excited resonances located around 6 and 10 eV. The formation of the other nonmodified products leading to cleavage of the phosphodiester bond is suggested to occur principally via two different mechanisms: (1) the formation of a core-excited resonance on the phosphate unit followed by dissociation of the transient anion and (2) dissociation of the CO bond of the phosphate group formed by resonance electron transfer from the bases. In each case, phosphodiester bond cleavage leads chiefly to the formation of stable phosphate anions and sugar radicals with minimal amounts of alkoxyl anions and phosphoryl radicals.
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Affiliation(s)
- Yi Zheng
- Group in the Radiation Sciences, Faculty of Medicine, Université de Sherbrooke, Québec, Canada.
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Hedhili MN, Cloutier P, Bass AD, Madey TE, Sanche L. Electron stimulated desorption of anionic fragments from films of pure and electron-irradiated thiophene. J Chem Phys 2007; 125:094704. [PMID: 16965102 DOI: 10.1063/1.2338030] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The electron stimulated desorption (ESD) of anions is used to explore the effects of electron irradiation on a thiophene film and we report measurements for electron impact on multilayer thiophene condensed on a polycrystalline platinum substrate. Below 22 eV and at low electron dose, desorbed anions include H- (the dominant signal) as well as S-, CH2-, SH- and SCH2-. Yield functions show that anions are desorbed both by dissociative electron attachment (DEA) with resonances observed at 9.5, 11, and 16 eV, and for energies >13 eV, by dipolar dissociation (DD). An increase in the S- signal from electron irradiated (beam-damaged) thiophene films and the appearance of a new DEA resonance in the S- yield function at 6 eV are linked to rupture of the thiophene ring and the formation of sulfur-terminated products within the film. The threshold energy for ring rupture is 5 eV. The desorption of new anions such as C4H3S- (Thiophene-H)- is also observed from electron irradiated films and these likely arise from the decomposition of large radiation product molecules synthesized in the film. The yield functions of H-, S-, SH-, (Thiophene-H)-, and (Thiophene+H)- anions from irradiated thiophene films that have been annealed to 300 K, each exhibit a single resonant feature centered around 5.1 eV, suggesting that all signals derive from DEA to the same molecular radiation product. In contrast, only H- and S- are observed to desorb from films of 2-2-bithiophene and no resonance is seen below approximately 10 eV in the anion yield functions. These data suggest that electron irradiation causes formation of ring-opened oligomers, and that closed-ring or 'classical" oligomers, (similar to bithiophene) if formed, contribute little to the ESD of anions.
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Affiliation(s)
- M N Hedhili
- Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854 -8019, USA
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Imhoff M, Parenteau L, Sanche L, Huels MA. Low energy electron and O– reactions in films of O2 coadsorbed with benzene or toluene. Phys Chem Chem Phys 2005; 7:3359-67. [PMID: 16240051 DOI: 10.1039/b506973d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A detailed understanding of nascent reactive events leading to DNA damage is required to describe ionizing radiation effects on living cells. These early, sub-picosecond events involve mainly low energy (E < 20 eV) secondary electrons (SE), and low energy (E < 5 eV) secondary ion (and neutral) fragments; the latter are created either by the primary radiation, or by SE via dissociative electron attachment (DEA). While recent work has shown that SE initiate DNA strand break formation via DEA, the subsequent damage induced by the DEA ion fragments in DNA, or its basic components is unknown. Here, we report 0-20 eV electron impact measurements of anion desorption from condensed films containing O2 and either benzene (C6H6), or toluene (C6H5CH3); these molecules represent the most fundamental structural analogs of pyrimidine bases. Our experiments show that all of the observed OH- yields are the result of reactive scattering of 1-5 eV O- fragments produced initially by DEA to O2. These O- reactions involve hydrogen abstraction from benzene or toluene, and result in the formation of benzyl radicals, or toluene radicals centered on either the ring or exocyclic methyl group. O- scatters over nm distances comparable to DNA dimensions, and reactions involve a transient anion collision complex. Anion desorption is found to depend on both, the temperature of hydrocarbon film formation (morphology), and the order of overlayer adsorption, e.g. O2 on benzene, or benzene on O2. Our measurements support the notion that in irradiated DNA similar secondary-ion reactions can be initiated by the abundant secondary electrons, and may lead to clustered damage.
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Affiliation(s)
- Marjorie Imhoff
- Dept. of Nuclear Medicine and Radiobiology, Faculty of Medicine, University of Sherbrooke, Sherbrooke, Québec, CanadaJ1H 5N4
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Mozejko P, Bass AD, Parenteau L, Sanche L. Intrinsic and extrinsic factors in anion electron-stimulated desorption: D− from deuterated hydrocarbons condensed on Kr and water ice films. J Chem Phys 2004; 121:10181-9. [PMID: 15549893 DOI: 10.1063/1.1807813] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The results of D(-) ion desorption induced by 3-20 eV electrons incident on condensed CD(4), C(2)D(6), C(3)D(8), C(2)D(4), and C(2)D(2) are presented. These compounds were deposited in submonolayer amounts on the surfaces of multilayer solid films of Kr and nonporous and porous amorphous ice. While desorption of the D(-) anions proceeds via well-known processes, i.e., dissociative electron attachment (DEA) and dipolar dissociation, significant perturbations of these processes due to presence of the different film substrates are observed. We have shown that it is possible to distinguish between the character and nature of these perturbations. The presence of the nonporous ice perturbs the D(-) desorption intensity by affecting the intrinsic properties of the intermediate anion states through which dissociation proceeds. On the other hand, the presence of the porous ice introduces extrinsic effects, which can affect electron energy losses prior to their interaction with the hydrocarbon molecule and/or the energies and intensities of the fragment species after dissociation. Simple mechanisms responsible for the observed variations in the intensities of desorbed anionic signals are proposed and discussed. Electron transfer from transient anion states to electron states of the substrate film or nearby hydrocarbon molecules appear as the most efficient mechanism to reduce the magnitude of the DEA process.
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Affiliation(s)
- Paweł Mozejko
- Groupe en Sciences des Radiations, Faculté de Medecine, Université de Sherbrooke, Sherbrooke, Québec J1H5N4 Canada.
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Solovev S, Kusmierek DO, Madey TE. Negative ion formation in electron-stimulated desorption of CF2Cl2 coadsorbed with polar NH3 on Ru(0001). J Chem Phys 2004; 120:968-78. [PMID: 15267934 DOI: 10.1063/1.1630296] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photon-induced dissociation of CF2Cl2 (freon-12) in the stratosphere contributes substantially to atmospheric ozone depletion. We report recent results on dissociation and negative ion formation in electron-stimulated desorption (ESD) of CF2Cl2 on Ru(0001), when CF2Cl2 is coadsorbed with a polar molecule (NH3), for electron energies ranging from 50 to 300 eV. Two different time-of-flight methods are used in this investigation: (a) an ESD ion angular distribution detector with wide collection angle and (b) a quadrupole mass spectrometer with narrow collection angle and high mass resolution. Many negative ESD fragments are seen (F-, Cl-, FCl-, CF-, F2-, and Cl2-), whose intensities depend on the surface preparation. Using both detectors we observe a giant enhancement of Cl- and F- yields for ESD of CF2Cl2 coadsorbed with approximately 1 ML of NH3; this enhancement (>10(3) for Cl-) is specific to certain ions, and is attributed to an increased probability of dissociative electron attachment due to "trapped" low-energy secondary electrons, i.e., precursor states of the solvated electron in NH3. In further studies, the influence of polar NH3 spacer layers (1-10 ML) on ESD of top-layer CF2Cl2 is determined, and compared with thick films of condensed CF2Cl2. The magnitudes and energy dependences of the Cl- yields are different in these cases, due to several contributing factors.
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Affiliation(s)
- S Solovev
- Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854-8019, USA
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Balog R, Stano M, Limão-Vieira P, König C, Bald I, Mason NJ, Illenberger E. Low energy electron interaction with free and bound SF5CF3: Negative ion formation from single molecules, clusters and nanofilms. J Chem Phys 2003. [DOI: 10.1063/1.1617978] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bass AD, Sanche L. Dissociative electron attachment and charge transfer in condensed matter. Radiat Phys Chem Oxf Engl 1993 2003. [DOI: 10.1016/s0969-806x(03)00244-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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D− ion desorption from condensed CD4, C2D2, C2D4, C2D6 and C3D8 molecules induced by electron impact. Radiat Phys Chem Oxf Engl 1993 2003. [DOI: 10.1016/s0969-806x(03)00285-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hervé du Penhoat MA, Huels MA, Cloutier P, Jay-Gerin JP, Sanche L. Electron stimulated desorption of H−from thin films of 5-halouracils. Phys Chem Chem Phys 2003. [DOI: 10.1039/b212552h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hervé du Penhoat MA, Huels MA, Cloutier P, Jay-Gerin JP, Sanche L. Electron stimulated desorption of H− from thin films of thymine and uracil. J Chem Phys 2001. [DOI: 10.1063/1.1349707] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lu QB, Madey TE. Factors Influencing Cl- and F- Enhancements in Electron-Stimulated Desorption of CF2Cl2 Coadsorbed with Other Gases. J Phys Chem B 2001. [DOI: 10.1021/jp003161y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Q.-B. Lu
- Laboratory for Surface Modification and Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854-8019
| | - Theodore E. Madey
- Laboratory for Surface Modification and Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854-8019
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Langer J, Matt S, Meinke M, Tegeder P, Stamatovic A, Illenberger E. Negative ion formation from low energy (0–15 eV) electron impact to CF2Cl2 under different phase conditions. J Chem Phys 2000. [DOI: 10.1063/1.1326849] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bass AD, Parenteau L, Weik F, Sanche L. The effects of temperature and morphology on electron transmission and stimulated desorption of H− from thin hydrocarbon films. J Chem Phys 2000. [DOI: 10.1063/1.1318200] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Antic D, Parenteau L, Sanche L. Electron-Stimulated Desorption of H- from Condensed-Phase Deoxyribose Analogues: Dissociative Electron Attachment versus Resonance Decay into Dipolar Dissociation. J Phys Chem B 2000. [DOI: 10.1021/jp000206m] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Antic
- Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Faculté de Médecine, Université de Sherbrooke, Québec J1H 5N4, Canada
| | - L. Parenteau
- Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Faculté de Médecine, Université de Sherbrooke, Québec J1H 5N4, Canada
| | - L. Sanche
- Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Faculté de Médecine, Université de Sherbrooke, Québec J1H 5N4, Canada
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Antic D, Parenteau L, Lepage M, Sanche L. Low-Energy Electron Damage to Condensed-Phase Deoxyribose Analogues Investigated by Electron Stimulated Desorption of H- and Electron Energy Loss Spectroscopy. J Phys Chem B 1999. [DOI: 10.1021/jp990686l] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. Antic
- Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Faculté de Médecine, Université de Sherbrooke, Québec, J1H 5N4, Canada
| | - L. Parenteau
- Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Faculté de Médecine, Université de Sherbrooke, Québec, J1H 5N4, Canada
| | - M. Lepage
- Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Faculté de Médecine, Université de Sherbrooke, Québec, J1H 5N4, Canada
| | - L. Sanche
- Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Faculté de Médecine, Université de Sherbrooke, Québec, J1H 5N4, Canada
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Bass AD, Parenteau L, Huels MA, Sanche L. Reactive scattering of O− in organic films at subionization collision energies. J Chem Phys 1998. [DOI: 10.1063/1.477530] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Weik F, Illenberger E. Dissociative electron attachment and charging of SF6 adsorbed on rare-gas films. J Chem Phys 1998. [DOI: 10.1063/1.477234] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Simpson WC, Orlando TM, Parenteau L, Nagesha K, Sanche L. Dissociative electron attachment in nanoscale ice films: Thickness and charge trapping effects. J Chem Phys 1998. [DOI: 10.1063/1.475924] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Simpson WC, Sieger MT, Orlando TM, Parenteau L, Nagesha K, Sanche L. Dissociative electron attachment in nanoscale ice films: Temperature and morphology effects. J Chem Phys 1997. [DOI: 10.1063/1.475019] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Huels MA, Parenteau L, Sanche L. Substrate sensitivity of dissociative electron attachment to physisorbed aniline. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)01026-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Ayotte P, Gamache J, Bass AD, Fabrikant II, Sanche L. Absolute cross sections for dissociative electron attachment to condensed CH3Cl and CH3Br: Effects of potential energy curve crossing and capture probability. J Chem Phys 1997. [DOI: 10.1063/1.473163] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- P. Ayotte
- Groupe du CRM en Sciences des Radiations, Faculteá de médecine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - J. Gamache
- Groupe du CRM en Sciences des Radiations, Faculteá de médecine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - A. D. Bass
- Groupe du CRM en Sciences des Radiations, Faculteá de médecine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - I. I. Fabrikant
- Groupe du CRM en Sciences des Radiations, Faculteá de médecine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - L. Sanche
- Groupe du CRM en Sciences des Radiations, Faculteá de médecine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
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Ingólfsson O, Weik F, Illenberger E. The reactivity of slow electrons with molecules at different degrees of aggregation: gas phase, clusters and condensed phase. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/s0168-1176(96)04392-3] [Citation(s) in RCA: 118] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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30
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Tronc M, Azria R, Le Coat Y, Illenberger E. Threefold Differential Electron-Stimulated Desorption Yields of D- Anions from Multilayer Films of D2O and ND3 Condensed on Platinum. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9604305] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Tronc
- Laboratoire de Chimie Physique-Matière et Rayonnement, Université Pierre et Marie Curie, 11 rue Pierre et Marie Curie, F-75231 Paris, Cedex 05 France
| | - R. Azria
- Laboratoire des Collisions Atomiques et Moléculaires, Bat 351, Université Paris-Sud, 91405 Orsay, France
| | - Y. Le Coat
- Laboratoire des Collisions Atomiques et Moléculaires, Bat 351, Université Paris-Sud, 91405 Orsay, France
| | - E. Illenberger
- Institut für Physikalische und Theoretische Chemie der Freien Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany
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Shi H, Cloutier P, Gamache J, Sanche L. Dynamics of low-energy-electron stimulated desorption of metastable particles from N2 condensed on Xe and Kr films. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:13830-13838. [PMID: 9983138 DOI: 10.1103/physrevb.53.13830] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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32
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Rowntree P, Dugal PC, Hunting D, Sanche L. Electron Stimulated Desorption of H2 from Chemisorbed Molecular Monolayers. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9521159] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- P. Rowntree
- Département de chimie, Université de Sherbrooke, J1K 2R1 Sherbrooke, Québec, Canada, and MRC Group of Radiation Sciences, Département de Médecine Nucléaire et de Radiobiologie, Université de Sherbrooke, J1H 5N4 Sherbrooke, Québec Canada
| | - P.-C. Dugal
- Département de chimie, Université de Sherbrooke, J1K 2R1 Sherbrooke, Québec, Canada, and MRC Group of Radiation Sciences, Département de Médecine Nucléaire et de Radiobiologie, Université de Sherbrooke, J1H 5N4 Sherbrooke, Québec Canada
| | - D. Hunting
- Département de chimie, Université de Sherbrooke, J1K 2R1 Sherbrooke, Québec, Canada, and MRC Group of Radiation Sciences, Département de Médecine Nucléaire et de Radiobiologie, Université de Sherbrooke, J1H 5N4 Sherbrooke, Québec Canada
| | - L. Sanche
- Département de chimie, Université de Sherbrooke, J1K 2R1 Sherbrooke, Québec, Canada, and MRC Group of Radiation Sciences, Département de Médecine Nucléaire et de Radiobiologie, Université de Sherbrooke, J1H 5N4 Sherbrooke, Québec Canada
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33
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Huels M, Bass A, Ayotte P, Sanche L. Absolute cross sections for anion production by low energy electron impact on physisorbed CO2. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)01029-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Huels MA, Parenteau L, Cloutier P, Sanche L. Electron stimulated desorption of O− and metastable CO* from physisorbed CO2. J Chem Phys 1995. [DOI: 10.1063/1.470356] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Huels MA, Parenteau L, Sanche L. Kinetic-energy distributions of O- produced by dissociative electron attachment to O2 physisorbed on a Kr substrate. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:11343-11350. [PMID: 9980240 DOI: 10.1103/physrevb.52.11343] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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36
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Mann A, Cloutier P, Liu D, Sanche L. Excitation-energy transfer and metastable-particle desorption from electron-bombarded Xe films with N2 and CO top layers. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:7200-7206. [PMID: 9977283 DOI: 10.1103/physrevb.51.7200] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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37
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Huels MA, Parenteau L, Michaud M, Sanche L. Kinetic-energy distributions of O- produced by dissociative electron attachment to physisorbed O2. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 51:337-349. [PMID: 9911590 DOI: 10.1103/physreva.51.337] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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38
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Rowntree P, Sanche L, Parenteau L, Meinke M, Weik F, Illenberger E. Dissociative electron attachment to condensed and adsorbed halomethanes. J Chem Phys 1994. [DOI: 10.1063/1.467475] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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Michaud M, Cloutier P, Sanche L. Feshbach-type electron resonances in solid Ar, Kr, and Xe films: Decay into multiphonon excitations. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:11336-11346. [PMID: 10007446 DOI: 10.1103/physrevb.48.11336] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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40
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Huels M, Parenteau L, Sanche L. Quenching of the dissociative electron attachment resonances of O2 physisorbed on amorphous ice. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)87033-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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41
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Sanche L. Electronic aging and related electron interactions in thin-film dielectrics. ACTA ACUST UNITED AC 1993. [DOI: 10.1109/14.237742] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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