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Mirghaffari N, Iannarelli R, Ludwig C, Rossi MJ. Coexistence of reactive functional groups at the interface of a powdered activated amorphous carbon: a molecular view. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1966110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - Riccardo Iannarelli
- École Polytechnique Fédérale de Lausanne (EPFL), Safety Competence Center, EPFL RHO DSPS-SCC, Lausanne, Switzerland
| | - Christian Ludwig
- École Polytechnique Fédérale de Lausanne (EPFL), ENAC IIE GR-LUD, Lausanne, Switzerland
- Paul Scherrer Institute (PSI), ENE LBK CPM, Villigen, Switzerland
| | - Michel J. Rossi
- École Polytechnique Fédérale de Lausanne (EPFL), ENAC IIE GR-LUD, Lausanne, Switzerland
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2
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Congiu E, Sow A, Nguyen T, Baouche S, Dulieu F. A new multi-beam apparatus for the study of surface chemistry routes to formation of complex organic molecules in space. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:124504. [PMID: 33379980 DOI: 10.1063/5.0018926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 11/07/2020] [Indexed: 06/12/2023]
Abstract
A multi-beam ultra-high vacuum apparatus is presented. In this article, we describe the design and construction of a new laboratory astrophysics experiment-VErs de NoUvelles Synthèses (VENUS)-that recreates the solid-state non-energetic formation conditions of complex organic molecules in dark clouds and circumstellar environments. The novel implementation of four operational differentially pumped beam lines will be used to determine the feasibility and the rates for the various reactions that contribute to formation of molecules containing more than six atoms. Data are collected by means of Fourier transform infrared spectroscopy and quadrupole mass spectrometry. The gold-coated sample holder reaches temperatures between 7 K and 400 K. The apparatus was carefully calibrated and the acquisition system was developed to ensure that experimental parameters are recorded as accurately as possible. A great effort has been made to have the beam lines converge toward the sample. Experiments have been developed to check the beam alignment using reacting systems of neutral species (NH3 and H2CO). Preliminary original results were obtained for the {NO + H} system, which shows that chemistry occurs only in the very first outer layer of the deposited species, that is, the chemical layer and the physical layer coincide. This article illustrates the characteristics, performance, and future potential of the new apparatus in view of the forthcoming launch of the James Webb Space Telescope. We show that VENUS will have a major impact through its contributions to surface science and astrochemistry.
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Affiliation(s)
- E Congiu
- CY Cergy Paris Université, Sorbonne Université, Observatoire de Paris, PSL University, CNRS, LERMA, F-95000 Cergy, France
| | - A Sow
- CY Cergy Paris Université, Sorbonne Université, Observatoire de Paris, PSL University, CNRS, LERMA, F-95000 Cergy, France
| | - T Nguyen
- CY Cergy Paris Université, Sorbonne Université, Observatoire de Paris, PSL University, CNRS, LERMA, F-95000 Cergy, France
| | - S Baouche
- CY Cergy Paris Université, Sorbonne Université, Observatoire de Paris, PSL University, CNRS, LERMA, F-95000 Cergy, France
| | - F Dulieu
- CY Cergy Paris Université, Sorbonne Université, Observatoire de Paris, PSL University, CNRS, LERMA, F-95000 Cergy, France
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3
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Wakelam V, Bron E, Cazaux S, Dulieu F, Gry C, Guillard P, Habart E, Hornekær L, Morisset S, Nyman G, Pirronello V, Price SD, Valdivia V, Vidali G, Watanabe N. H 2 formation on interstellar dust grains: The viewpoints of theory, experiments, models and observations. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.molap.2017.11.001] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Senevirathne B, Andersson S, Dulieu F, Nyman G. Hydrogen atom mobility, kinetic isotope effects and tunneling on interstellar ices (I and ASW). ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.molap.2017.01.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Marchione D, McCoustra MRS. Non-covalent interaction of benzene with methanol and diethyl ether solid surfaces. Phys Chem Chem Phys 2016; 18:20790-801. [DOI: 10.1039/c6cp01787h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We have investigated the interactions involved at the interface of binary, layered ices (benzene on methanol and on diethyl ether) by means of laboratory experiments and ab initio calculations on model clusters.
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6
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Amiaud L, Fillion JH, Dulieu F, Momeni A, Lemaire JL. Physisorption and desorption of H2, HD and D2 on amorphous solid water ice. Effect on mixing isotopologue on statistical population of adsorption sites. Phys Chem Chem Phys 2015; 17:30148-57. [DOI: 10.1039/c5cp03985a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We study the adsorption and desorption of three isotopologues of molecular hydrogen mixed on 10 ML of porous amorphous water ice (ASW) deposited at 10 K.
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Affiliation(s)
- Lionel Amiaud
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- University Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay
| | | | - François Dulieu
- LERMA
- Observatoire de Paris
- PSL Research University
- CNRS
- Sorbonnes Universités
| | - Anouchah Momeni
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- University Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay
| | - Jean-Louis Lemaire
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- University Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay
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7
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He J, Vidali G. Application of a diffusion-desorption rate equation model in astrochemistry. Faraday Discuss 2014; 168:517-32. [PMID: 25302396 DOI: 10.1039/c3fd00113j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Desorption and diffusion are two of the most important processes on interstellar grain surfaces; knowledge of them is critical for the understanding of chemical reaction networks in the interstellar medium (ISM). However, a lack of information on desorption and diffusion is preventing further progress in astrochemistry. To obtain desorption energy distributions of molecules from the surfaces of ISM-related materials, one usually carries out adsorption-desorption temperature programmed desorption (TPD) experiments, and uses rate equation models to extract desorption energy distributions. However, the often-used rate equation models fail to adequately take into account diffusion processes and thus are only valid in situations where adsorption is strongly localized. As adsorption-desorption experiments show that adsorbate molecules tend to occupy deep adsorption sites before occupying shallow ones, a diffusion process must be involved. Thus, it is necessary to include a diffusion term in the model that takes into account the morphology of the surface as obtained from analyses of TPD experiments. We take the experimental data of CO desorption from the MgO(100) surface and of D2 desorption from amorphous solid water ice as examples to show how a diffusion-desorption rate equation model explains the redistribution of adsorbate molecules among different adsorption sites. We extract distributions of desorption energies and diffusion energy barriers from TPD profiles. These examples are contrasted with a system where adsorption is strongly localized--HD from an amorphous silicate surface. Suggestions for experimental investigations are provided.
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8
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Minissale M, Dulieu F. Influence of surface coverage on the chemical desorption process. J Chem Phys 2014; 141:014304. [PMID: 25005286 DOI: 10.1063/1.4885847] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In cold astrophysical environments, some molecules are observed in the gas phase whereas they should have been depleted, frozen on dust grains. In order to solve this problem, astrochemists have proposed that a fraction of molecules synthesized on the surface of dust grains could desorb just after their formation. Recently the chemical desorption process has been demonstrated experimentally, but the key parameters at play have not yet been fully understood. In this article, we propose a new procedure to analyze the ratio of di-oxygen and ozone synthesized after O atoms adsorption on oxidized graphite. We demonstrate that the chemical desorption efficiency of the two reaction paths (O+O and O+O2) is different by one order of magnitude. We show the importance of the surface coverage: for the O+O reaction, the chemical desorption efficiency is close to 80% at zero coverage and tends to zero at one monolayer coverage. The coverage dependence of O+O chemical desorption is proved by varying the amount of pre-adsorbed N2 on the substrate from 0 to 1.5 ML. Finally, we discuss the relevance of the different physical parameters that could play a role in the chemical desorption process: binding energy, enthalpy of formation, and energy transfer from the new molecule to the surface or to other adsorbates.
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Affiliation(s)
- M Minissale
- LERMA, Université de Cergy Pontoise et Observatoire de Paris, UMR 8112 du CNRS. 5, mail Gay Lussac, 95031 Cergy Pontoise, France
| | - F Dulieu
- LERMA, Université de Cergy Pontoise et Observatoire de Paris, UMR 8112 du CNRS. 5, mail Gay Lussac, 95031 Cergy Pontoise, France
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9
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Minissale M, Congiu E, Dulieu F. Oxygen diffusion and reactivity at low temperature on bare amorphous olivine-type silicate. J Chem Phys 2014; 140:074705. [DOI: 10.1063/1.4864657] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Minissale M, Fedoseev G, Congiu E, Ioppolo S, Dulieu F, Linnartz H. Solid state chemistry of nitrogen oxides – Part I: surface consumption of NO. Phys Chem Chem Phys 2014; 16:8257-69. [DOI: 10.1039/c3cp54917h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NO2 is efficiently formed in the solid state via NO + O/O2/O3 reactions.
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Affiliation(s)
- M. Minissale
- LERMA-LAMAp
- Université de Cergy-Pontoise
- Observatoire de Paris
- ENS
- UPMC
| | - G. Fedoseev
- Raymond and Beverly Sackler Laboratory for Astrophysics
- Leiden Observatory
- Leiden University
- 2300 RA Leiden, The Netherlands
| | - E. Congiu
- LERMA-LAMAp
- Université de Cergy-Pontoise
- Observatoire de Paris
- ENS
- UPMC
| | - S. Ioppolo
- Division of Geological and Planetary Sciences
- California Institute of Technology
- Pasadena, USA
- Institute for Molecules and Materials
- Radboud University Nijmegen
| | - F. Dulieu
- LERMA-LAMAp
- Université de Cergy-Pontoise
- Observatoire de Paris
- ENS
- UPMC
| | - H. Linnartz
- Raymond and Beverly Sackler Laboratory for Astrophysics
- Leiden Observatory
- Leiden University
- 2300 RA Leiden, The Netherlands
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11
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He J, Jing D, Vidali G. Atomic oxygen diffusion on and desorption from amorphous silicate surfaces. Phys Chem Chem Phys 2014; 16:3493-500. [DOI: 10.1039/c3cp54328e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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12
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Cuppen HM, Karssemeijer LJ, Lamberts T. The kinetic Monte Carlo method as a way to solve the master equation for interstellar grain chemistry. Chem Rev 2013; 113:8840-71. [PMID: 24187949 PMCID: PMC3934372 DOI: 10.1021/cr400234a] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Indexed: 01/21/2023]
Affiliation(s)
- H. M. Cuppen
- Theoretical
Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen , 6525 AJ Nijmegen, The Netherlands
| | - L. J. Karssemeijer
- Theoretical
Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen , 6525 AJ Nijmegen, The Netherlands
| | - T. Lamberts
- Theoretical
Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen , 6525 AJ Nijmegen, The Netherlands
- Sackler
Laboratory for Astrophysics, Leiden Observatory, Leiden University, 2300
RA Leiden, The Netherlands
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13
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Affiliation(s)
- Gianfranco Vidali
- Syracuse University , 201 Physics Building, Syracuse, New York 13244, United States
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14
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Hama T, Watanabe N. Surface Processes on Interstellar Amorphous Solid Water: Adsorption, Diffusion, Tunneling Reactions, and Nuclear-Spin Conversion. Chem Rev 2013; 113:8783-839. [DOI: 10.1021/cr4000978] [Citation(s) in RCA: 211] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tetsuya Hama
- Institute of Low Temperature
Science, Hokkaido University, N19W8 Kita-ku, Sapporo, Hokkaido 060-0819, Japan
| | - Naoki Watanabe
- Institute of Low Temperature
Science, Hokkaido University, N19W8 Kita-ku, Sapporo, Hokkaido 060-0819, Japan
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15
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Minissale M, Congiu E, Baouche S, Chaabouni H, Moudens A, Dulieu F, Accolla M, Cazaux S, Manicó G, Pirronello V. Quantum tunneling of oxygen atoms on very cold surfaces. PHYSICAL REVIEW LETTERS 2013; 111:053201. [PMID: 23952395 DOI: 10.1103/physrevlett.111.053201] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Indexed: 06/02/2023]
Abstract
Any evolving system can change state via thermal mechanisms (hopping a barrier) or via quantum tunneling. Most of the time, efficient classical mechanisms dominate at high temperatures. This is why an increase of the temperature can initiate the chemistry. We present here an experimental investigation of O-atom diffusion and reactivity on water ice. We explore the 6-25 K temperature range at submonolayer surface coverages. We derive the diffusion temperature law and observe the transition from quantum to classical diffusion. Despite the high mass of O, quantum tunneling is efficient even at 6 K. As a consequence, the solid-state astrochemistry of cold regions should be reconsidered and should include the possibility of forming larger organic molecules than previously expected.
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Affiliation(s)
- M Minissale
- Université de Cergy Pontoise and Observatoire de Paris, ENS, UPMC, UMR 8112 du CNRS 5, mail Gay Lussac, 95000 Cergy Pontoise cedex, France.
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16
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Williams D, Viti S. Modelling interstellar physics and chemistry: implications for surface and solid-state processes. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2013; 371:20110587. [PMID: 23734052 DOI: 10.1098/rsta.2011.0587] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We discuss several types of regions in the interstellar medium of the Milky Way and other galaxies in which the chemistry appears to be influenced or dominated by surface and solid-state processes occurring on or in interstellar dust grains. For some of these processes, for example, the formation of H₂ molecules, detailed experimental and theoretical approaches have provided excellent fundamental data for incorporation into astrochemical models. In other cases, there is an astrochemical requirement for much more laboratory and computational study, and we highlight these needs in our description. Nevertheless, in spite of the limitations of the data, it is possible to infer from astrochemical modelling that surface and solid-state processes play a crucial role in astronomical chemistry from early epochs of the Universe up to the present day.
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Affiliation(s)
- David Williams
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
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17
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Abdulgalil AGM, Marchione D, Thrower JD, Collings MP, McCoustra MRS, Islam F, Palumbo ME, Congiu E, Dulieu F. Laboratory studies of electron and ion irradiation of solid acetonitrile (CH₃CN). PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2013; 371:20110586. [PMID: 23734051 DOI: 10.1098/rsta.2011.0586] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The structure and bonding of solid acetonitrile (CH₃CN) films on amorphous silica are studied, and chemical and physical processes under irradiation with 200 keV protons and 250-400 eV electrons are quantified using transmission infrared spectroscopy, reflection-absorption infrared spectroscopy and temperature-programmed desorption, with the assistance of basic computational chemistry and nuclear materials calculations. The thermal desorption profiles are found to depend strongly on the balance between CH₃CN-surface and CH₃CN-CH₃CN interactions, passing from a sub-monolayer regime (binding energy: 35-50 kJ mol⁻¹) to a multilayer regime (binding energy: 38.2±1.0 kJ mol⁻¹) via a fractional order desorption regime characteristic of islanding as the coverage increases. Calculations using the SRIM code reveal that the effects of the ion irradiation are dominated by electronic stopping of incident protons, and the subsequent generation of secondary electrons. Therefore, ion irradiation and electron irradiation experiments can be quantitatively compared. During ion irradiation of thicker CH₃CN films, a cross section for secondary electron-promoted chemical destruction of CH3CN of 4 (±1) × 10⁻¹⁸ cm² was measured, while electron-promoted desorption was not detected. A significantly higher cross section for electron-promoted desorption of 0.82-3.2 × 10⁻¹⁵ cm² was measured during electron irradiation of thinner CH₃CN films, while no chemical products were detected. The differences between the experimental results can be rationalized by recognizing that chemical reaction is a bulk effect in the CH₃CN film, whereas desorption is a surface sensitive process. In thicker films, electron-promoted desorption is expected to occur a rate that is independent of the film thickness; i.e. show zeroth-order kinetics with respect to the surface concentration.
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Affiliation(s)
- A G M Abdulgalil
- School of Engineering and Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK
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Koning J, Kroes GJ, Arasa C. Isotope effects on the photodesorption processes of X2O (X = H,D) and HOD ice. J Chem Phys 2013; 138:104701. [DOI: 10.1063/1.4793733] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Chaabouni H, Minissale M, Manicò G, Congiu E, Noble JA, Baouche S, Accolla M, Lemaire JL, Pirronello V, Dulieu F. Water formation through O2 + D pathway on cold silicate and amorphous water ice surfaces of interstellar interest. J Chem Phys 2012; 137:234706. [PMID: 23267497 DOI: 10.1063/1.4771663] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H Chaabouni
- LERMA, UMR 8112 du CNRS, de l'Observatoire de Paris et de l'Université de Cergy Pontoise, 5 mail Gay Lussac, 95000 Cergy Pontoise Cedex, France.
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20
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Congiu E, Chaabouni H, Laffon C, Parent P, Baouche S, Dulieu F. Efficient surface formation route of interstellar hydroxylamine through NO hydrogenation. I. The submonolayer regime on interstellar relevant substrates. J Chem Phys 2012; 137:054713. [DOI: 10.1063/1.4738895] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Accolla M, Congiu E, Dulieu F, Manicò G, Chaabouni H, Matar E, Mokrane H, Lemaire JL, Pirronello V. Changes in the morphology of interstellar ice analogues after hydrogen atom exposure. Phys Chem Chem Phys 2011; 13:8037-45. [DOI: 10.1039/c0cp01462a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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He J, Frank P, Vidali G. Interaction of hydrogen with surfaces of silicates: single crystal vs. amorphous. Phys Chem Chem Phys 2011; 13:15803-9. [DOI: 10.1039/c1cp21601e] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Matar E, Bergeron H, Dulieu F, Chaabouni H, Accolla M, Lemaire JL. Gas temperature dependent sticking of hydrogen on cold amorphous water ice surfaces of interstellar interest. J Chem Phys 2010; 133:104507. [DOI: 10.1063/1.3484867] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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24
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Thrower JD, Collings MP, Rutten FJM, McCoustra MRS. Thermal desorption of C6H6 from surfaces of astrophysical relevance. J Chem Phys 2009; 131:244711. [DOI: 10.1063/1.3267634] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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25
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Fillion JH, Amiaud L, Congiu E, Dulieu F, Momeni A, Lemaire JL. D(2) desorption kinetics on amorphous solid water: from compact to porous ice films. Phys Chem Chem Phys 2009; 11:4396-402. [PMID: 19458844 DOI: 10.1039/b822492g] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The desorption kinetics of D(2) from amorphous solid water (ASW) films have been studied by the temperature-programmed desorption (TPD) technique in the 10-30 K temperature range. Compact (and nonporous) films were grown at 120 K over a copper substrate. Ultra-thin porous films were additionally grown at 10 K over the compact base. The TPD spectra from compact and from up to 20 monolayers (ML) porous films were compared. The simulation of the TPD experimental traces provides the corresponding D(2) binding-energy distributions. As compared to the compact case, the binding-energy distribution found for the 10 ML porous film clearly extends to higher energies. To study the transition from compact to porous ice, porous films of intermediate thicknesses (<10 ML), including ultra-thin films (<1 ML), were grown over the compact substrate. The thermal D(2) desorption peak was found to shift to higher temperatures as the porous ice network was progressively formed. This behavior can be explained by the formation of more energetic binding sites related to porous films. TPD spectra were also modelled by using a combination of the two energy distributions, one associated to a bare compact ice and the other associated to a 10 ML porous ice film. This analysis reveals a very fast evolution of the binding-energy distribution towards that of porous ice. Our results show that few ML of additional porous film are sufficient to produce a sample for which the D(2) adsorption can be described by the energy distribution found for the 10 ML porous film. These experiments then provide evidence that the binding energy of D(2) on ASW ice is primarily governed by the topological and morphological disorder of the surface at molecular scale.
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Affiliation(s)
- Jean-Hugues Fillion
- LERMA-LAMAp, UMR CNRS 8112, Université Cergy-Pontoise et Observatoire de Paris, 5 Mail Gay-Lussac, F-95000, Cergy-Pontoise, France.
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Xu M, Sebastianelli F, Bačić Z. Quantum dynamics of H2, D2, and HD in the small dodecahedral cage of clathrate hydrate: Evaluating H2-water nanocage interaction potentials by comparison of theory with inelastic neutron scattering experiments. J Chem Phys 2008; 128:244715. [DOI: 10.1063/1.2945895] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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27
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Bachellerie D, Sizun M, Teillet-Billy D, Rougeau N, Sidis V. Eley-Rideal formation of H2 involving one of two para-chemisorbed H atoms on a graphite surface. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.09.071] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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