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3. TandEM: Titan and Enceladus mission

Author

Coustenis, A., Atreya, S. K., Balint, T., Brown, R. H., Dougherty, M. K., Ferri, F., Fulchignoni, M., Gautier, D., Gowen, R. A., Griffith, C. A., Gurvits, L. I., Jaumann, R., Langevin, Y., Leese, M. R., Lunine, J. I., McKay, C. P., Moussas, X., Müller-Wodarg, I., Neubauer, F., Owen, T. C., Raulin, F., Sittler, E. C., Sohl, F., Sotin, C., Tobie, G., Tokano, T., Turtle, E. P., Wahlund, J.-E., Waite, J. H., Baines, K. H., Blamont, J., Coates, A. J., Dandouras, I., Krimigis, T., Lellouch, E., Lorenz, R. D., Morse, A., Porco, C. C., Hirtzig, M., Saur, J., Spilker, T., Zarnecki, J. C., Choi, E., Achilleos, N., Amils, R., Annan, P., Atkinson, D. H., Bénilan, Y., Bertucci, C., Bézard, B., Bjoraker, G. L., Blanc, M., Boireau, L., Bouman, J., Cabane, M., Capria, M. T., Chassefière, E., Coll, P., Combes, M., Cooper, J. F., Coradini, A., Crary, F., Cravens, T., Daglis, I. A., de Angelis, E., de Bergh, C., de Pater, I., Dunford, C., Durry, G., Dutuit, O., Fairbrother, D., Flasar, F. M., Fortes, A. D., Frampton, R., Fujimoto, M., Galand, M., Grasset, O., Grott, M., Haltigin, T., Herique, A., Hersant, F., Hussmann, H., Ip, W., Johnson, R., Kallio, E., Kempf, S., Knapmeyer, M., Kofman, W., Koop, R., Kostiuk, T., Krupp, N., Küppers, M., Lammer, H., Lara, L.-M., Lavvas, P., Le Mouélic, S., Lebonnois, S., Ledvina, S., Li, J., Livengood, T. A., Lopes, R. M., Lopez-Moreno, J.-J., Luz, D., Mahaffy, P. R., Mall, U., Martinez-Frias, J., Marty, B., McCord, T., Menor Salvan, C., Milillo, A., Mitchell, D. G., Modolo, R., Mousis, O., Nakamura, M., Neish, C. D., Nixon, C. A., Nna Mvondo, D., Orton, G., Paetzold, M., Pitman, J., Pogrebenko, S., Pollard, W., Prieto-Ballesteros, O., Rannou, P., Reh, K., Richter, L., Robb, F. T., Rodrigo, R., Rodriguez, S., Romani, P., Ruiz Bermejo, M., Sarris, E. T., Schenk, P., Schmitt, B., Schmitz, N., Schulze-Makuch, D., Schwingenschuh, K., Selig, A., Sicardy, B., Soderblom, L., Spilker, L. J., Stam, D., Steele, A., Stephan, K., Strobel, D. F., Szego, K., Szopa, C., Thissen, R., Tomasko, M. G., Toublanc, D., Vali, H., Vardavas, I., Vuitton, V., West, R. A., Yelle, R., and Young, E. F.

Published
2009
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6. A hidden hydrogen transfer in the unimolecular reaction of 1,2-dimethoxyethane

Author

Thissen, R., Alcaraz, C., Dutuit, O., Mourgues, P., Chamot-Rooke, J., and Audier, H.E.

Subjects
Cations -- Research, Radicals (Chemistry) -- Research, Chemical reactions -- Research, Chemicals, plastics and rubber industries
Abstract

A study on the unimolecular reactions or fragmentation mechanisms of several R1CH2CH2R2.+ (R1 or R2 = OH, OCH3, OC2H5, NH2) radical cations was conducted to re-investigate the unimolecular reaction of a metastable 1,2-dimethoxyethane radical cation. Results of the experiment will furnish information about metastable processes and fragmentation thresholds with limited effects of kinetic shifts. Experimental methods, findings and conclusions are discussed.

Published
1999

12. Photodissociation processes of water vapor below and above the ionization potential.

Author

Dutuit, O., Tabche-Fouhaile, A., Nenner, I., Frohlich, H., and Guyon, P. M.

Subjects
*PHOTODISSOCIATION, *ATMOSPHERIC water vapor, *IONIZATION (Atomic physics), *PHOTOCHEMISTRY
Abstract

Fluorescence excitation spectra of OH(A), OH(B), OH(C), Lyman α, Balmer α, Balmer β, and H2O+(A) are recorded in H2O in the 9–35 eV photon excitation range. The OH(A) fluorescence quantum yield is measured from 9.2 to 13.6 eV incident photon energy. The pressure dependence of the H2O+(A) fluorescence excitation spectrum is investigated and the quenching rate constant of H2O+(A) by H2O is found to be equal to (4±2)×10-10 cm3 s-1. New Rydberg states are observed: a continuum-like state in the 10–12.6 eV range assigned to the (3a1)-1 (3pb2) 1B2 state and two broad bands lying at 27–29 and 30–32 eV, respectively, assigned to Rydberg states converging towards the (2a1)-1 innervalence state of H2O+. The valence character of the nsa1 Rydberg states is discussed. The decay processes of valence-type vs pure Rydberg states are investigated. All energetically accessible dissociation channels producing fluorescent fragments are observed and the fragments appear at their thermodynamical threshold. The competition between autoionization and dissociation into neutrals is shown to occur only for pure Rydberg states. Possible dissociation mechanisms are discussed. [ABSTRACT FROM AUTHOR]

Published
1985
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13. O+2 ions dissociation studied by threshold photoelectron–photoion coincidence method.

Author

Richard-Viard, M., Dutuit, O., Lavollée, M., Govers, T., Guyon, P. M., and Durup, J.

Subjects
*OXYGEN, *IONS, *PHOTOELECTRONS, *PHOTOIONIZATION
Abstract

The threshold photoelectron–photoion coincidence method was used to study O+2 dissociation. Previous results were confirmed and a careful analysis of the time of flight peak shapes using a Monte Carlo simulation gave us new results. The lifetime of the B 2Σ-g state was measured to be 70∓25 ns independently of the vibrational quantum number. The III 2∏u state which dissociates towards the O+(2D0)+O(3P) and O+(2P0)+O(3P) limits shows anisotropic distribution of fragment ions. The c 4Σ-u(v=0) state which was previously observed to dissociate into O+(4S0)+O(1D), its adiabatic limit, is seen to predissociate also about 40% towards the ground state limit. [ABSTRACT FROM AUTHOR]

Published
1985
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16. Experimental evidence of vibrational mode selectivity in the indirect predissociation of N2O+ A 2Σ+. Energy distribution of the diatomic fragment and comparison with a model prediction.

Author

Richard-Viard, M., Atabek, O., Dutuit, O., and Guyon, P. M.

Subjects
SPECTRAL energy distribution, VIBRATIONAL spectra
Abstract

The predissociation of the A 2Σ+ state of N2O+ has been reinvestigated with a threshold photoelectron–photoion coincidence experiment using synchrotron radiation as the excitation source and a newly designed spectrometer. The NO+ fragment vibrational distribution resulting from the predissociation of (1,0,0), (0,0,1), (2,0,0), (1,0,1), and (3,0,0) levels varies with vibrational excitation of the parent ion and in all cases is inverted and narrow. Both NO+(X 1Σ+)+N(4S0) and NO+(X 1Σ+)+N(2D0) limits are observed. Predissociation of the A state to the 2 4Σ- dissociative continuum is shown to proceed via an indirect mechanism involving the 1 4Π bound state. Close coupled quantum calculations were carried out with a simplified model for indirect predissociation in which the bending motion is neglected. They show the occurrence of vibrational population inversions in the fragment distributions, as observed experimentally. [ABSTRACT FROM AUTHOR]

Published
1990
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17. State-selected ion–molecule reactions: N+2(v)+H2→N2+H+2 and Ar+(2PJ) +H2→Ar+H+2.

Author

Henri, G., Lavollée, M., Dutuit, O., Ozenne, J. B., Guyon, P. M., and Gislason, E. A.

Subjects
CHARGE transfer, PHOTOELECTRONS, SYNCHROTRON radiation
Abstract

Charge transfer cross sections for state-selected N+2 (X,A;v) and Ar+(2PJ) ions colliding with H2 have been measured at laboratory energies of 10.5 and 14.5 eV by means of the TPEPICO (threshold-photoelectron/photoion coincidence) method using synchrotron radiation. The cross sections are put on an absolute basis by normalizing to earlier measurements for N+2+H2. For the purpose of comparison total cross sections have also been measured for state-selected H+2(v)+N2 at 10 eV lab. A simple model, which assumes that small impact parameter collisions lead to chemical reaction, gives a qualitative explanation of the N+2+H2 and Ar++H2 data. The work sheds light on previous problems with the application of the principle of microscopic reversibility to these systems. [ABSTRACT FROM AUTHOR]

Published
1988
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20. Proceedings of the 18th Symposium on Atomic and Surface Physics and Related Topics

Author

Lewerenz, Marius, Dutuit, O., Marquardt, R., Lewerenz, Marius, Laboratoire de Modélisation et Simulation Multi Echelle (MSME), Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG ), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de Strasbourg, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris-Est Marne-la-Vallée (UPEM), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Published
2012

21. TandEM: Titan and Enceladus mission

Author

Coustenis, A. Atreya, S.K. Balint, T. Brown, R.H. Dougherty, M.K. Ferri, F. Fulchignoni, M. Gautier, D. Gowen, R.A. Griffith, C.A. Gurvits, L.I. Jaumann, R. Langevin, Y. Leese, M.R. Lunine, J.I. McKay, C.P. Moussas, X. Müller-Wodarg, I. Neubauer, F. Owen, T.C. Raulin, F. Sittler, E.C. Sohl, F. Sotin, C. Tobie, G. Tokano, T. Turtle, E.P. Wahlund, J.-E. Waite, J.H. Baines, K.H. Blamont, J. Coates, A.J. Dandouras, I. Krimigis, T. Lellouch, E. Lorenz, R.D. Morse, A. Porco, C.C. Hirtzig, M. Saur, J. Spilker, T. Zarnecki, J.C. Choi, E. Achilleos, N. Amils, R. Annan, P. Atkinson, D.H. Bénilan, Y. Bertucci, C. Bézard, B. Bjoraker, G.L. Blanc, M. Boireau, L. Bouman, J. Cabane, M. Capria, M.T. Chassefière, E. Coll, P. Combes, M. Cooper, J.F. Coradini, A. Crary, F. Cravens, T. Daglis, I.A. de Angelis, E. de Bergh, C. de Pater, I. Dunford, C. Durry, G. Dutuit, O. Fairbrother, D. Flasar, F.M. Fortes, A.D. Frampton, R. Fujimoto, M. Galand, M. Grasset, O. Grott, M. Haltigin, T. Herique, A. Hersant, F. Hussmann, H. Ip, W. Johnson, R. Kallio, E. Kempf, S. Knapmeyer, M. Kofman, W. Koop, R. Kostiuk, T. Krupp, N. Küppers, M. Lammer, H. Lara, L.-M. Lavvas, P. Le Mouélic, S. Lebonnois, S. Ledvina, S. Li, J. Livengood, T.A. Lopes, R.M. Lopez-Moreno, J.-J. Luz, D. Mahaffy, P.R. Mall, U. Martinez-Frias, J. Marty, B. McCord, T. Salvan, C.M. Milillo, A. Mitchell, D.G. Modolo, R. Mousis, O. Nakamura, M. Neish, C.D. Nixon, C.A. Mvondo, D.N. Orton, G. Paetzold, M. Pitman, J. Pogrebenko, S. Pollard, W. Prieto-Ballesteros, O. Rannou, P. Reh, K. Richter, L. Robb, F.T. Rodrigo, R. Rodriguez, S. Romani, P. Bermejo, M.R. Sarris, E.T. Schenk, P. Schmitt, B. Schmitz, N. Schulze-Makuch, D. Schwingenschuh, K. Selig, A. Sicardy, B. Soderblom, L. Spilker, L.J. Stam, D. Steele, A. Stephan, K. Strobel, D.F. Szego, K. Szopa, C. Thissen, R. Tomasko, M.G. Toublanc, D. Vali, H. Vardavas, I. Vuitton, V. West, R.A. Yelle, R. Young, E.F.

Abstract

TandEM was proposed as an L-class (large) mission in response to ESA's Cosmic Vision 2015-2025 Call, and accepted for further studies, with the goal of exploring Titan and Enceladus. The mission concept is to perform in situ investigations of two worlds tied together by location and properties, whose remarkable natures have been partly revealed by the ongoing Cassini-Huygens mission. These bodies still hold mysteries requiring a complete exploration using a variety of vehicles and instruments. TandEM is an ambitious mission because its targets are two of the most exciting and challenging bodies in the Solar System. It is designed to build on but exceed the scientific and technological accomplishments of the Cassini-Huygens mission, exploring Titan and Enceladus in ways that are not currently possible (full close-up and in situ coverage over long periods of time). In the current mission architecture, TandEM proposes to deliver two medium-sized spacecraft to the Saturnian system. One spacecraft would be an orbiter with a large host of instruments which would perform several Enceladus flybys and deliver penetrators to its surface before going into a dedicated orbit around Titan alone, while the other spacecraft would carry the Titan in situ investigation components, i.e. a hot-air balloon (Montgolfière) and possibly several landing probes to be delivered through the atmosphere. © Springer Science + Business Media B.V. 2008.

Published
2009

22. Effects of input correlations in a complex chemistry model

Author

Carrasco, Nathalie, Hébrard, Eric, Dobrijevic, M., Thissen, R., Dutuit, O., Banaszkiewicz, M., Pernot., P., Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB)

Subjects
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Published
2007

23. Uncertainty propagation and sensitivity analysis: providing insights for simulation of Cassini's INMS ions data

Author

Carrasco, Nathalie, Pernot, P., Dutuit, O., Thissen, R., Banaszkiewicz, M., Dobrijevic, M., Hébrard, Eric, Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), and Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Published
2007

24. Photoionisation and ion-molecule reaction studies involving radical species of planetary interest

Author

Christian Alcaraz, Nicolas, C., Thissen, R., Dutuit, O., Zabka, J., Franceschi, P., Schüßler, T., Roth, W., J Deyerl, H., Elhanine, M., Gerber, T., Fischer, I., Laboratoire de Chimie Physique D'Orsay (LCPO), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), J. Heyrovský Institute of Physical Chemistry, J. Heyrovsky Institute of Physical Chemistry, Dipartimento di Fisica [Povo], and Università degli Studi di Trento (UNITN)

Subjects
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2006

25. Laboratory Experiments Relevant for the Chemistry of Titan Ionosphere

Author

Dutuit, O., Laboratoire de Chimie Physique D'Orsay (LCPO), and Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2006

28. The Science Case for 4GLS

Author

Allan, R.J., Allen, M.P., Alexandrov, A.S., Ashfold, M.N.R., Atkinson, R., Avaldi, L., Bain, C.D., Bancroft, J., Barrett, S.D., Barron, L.D., Bayliss, S., Becker, U., Benning, L.G., Berrah, N., Binns, C., Bisby, R.H., Bizau, J.M., Blake, R.J., Bowler, M.A., Bowyer, J., Brettle, J., Briggs, D., Brown, L.M., Brown, W.A., Burke, P.G., Cacho, C., Carter, R., Catlow, R., Cernik, R.J., Chesters, M., Clark, S.A., Clarke, D.T., Clarke, J.A., Codling, K., Cogdell, R., Connaughton, D., Connerade, J.P., Costello, J.T., Crapper, M.D., Creaser, C., Currell, F.J., Davies, P.B., de Jong, M., Dessent, C., Dhanak, V.R., Dobson, D.M., Dobson, P.J., Doig, A.J., Donovan, R.J., Dumas, P., Dunn, K., Dutuit, O., Dyke, J.M., Eastham, D.A., Egdell, R.G., Eland, J.H.D., Emerson, D.R., Eriksson, M., Erman, P., Evans, A., Evans, H., Evans, S., Field, T., Fielding, H., Fisher, A., Flavell, W.R., Ford, R., Frasinski, L.J., Freeman, N., Galayda, J.N., Gardner, P., Garside, J., Gay, N.J., Gejo, T., George, M., Gray, M.D., Greenshaw, T.J., Greig, D., Halsall, M.P., Hamilton, B., Harrison, N.M., Hasnain, S.S., Hatherly, P.A., Heathcote, P., Helliwell, J.R., Henderson, C.M.B, Hepburn, J., Hill, J., Hirst, G., Hirst, J.D., Holland, D.M.P., Horn, A.B., Horton, P., Hunt, M.R.C., Hutchinson, H., Inglesfield, J.E., Ivanov, V.K., Johnson, C.A.F., Johnson, L.N., Jones, D., Jones, F.H., Jones, G.R., Jones, L., Kadodwala, M., Karlsson, L., Kennedy, E.T., King, G.C., King, M.R.F., Kirkman, I.W., Kleese, K., Knight, P.L., Kylstra, N., Larkins, F.P., Latimer, C., Lawley, K.P., Leggett, G.J., Lewis, R.A., Lindsey, K., Lu, J.R., Lyng, F.M., Macdonald, M.A., Malins, A., Marangos, J.P., Margaritondo, G., Marsi, M., Marston, G., Martin, S.R., Martin-Fernandez, M.L., Mason, N.J., Matthew, J.A.D., McCoustra, M.R.S., McGilp, J., McGovern, I.T., McGrath, R., Meldrum, R.A., Meyer, M., Millar, T.J., Mitchell, D., Møller, S.P., Molster, F.J., Moriarty, P., Morin, P., Munro, I.H., Murdin, B.N., Nahon, L., Newell, W.R., Noble, C.J., Nordgren, E.J., Norman, P.R., O'Brien, P., O'Neill, P., O'Shea, P., Owen, H., Pain, R., Papiz, M., Parker, A., Parker, J., Parr, A., Pattrick, R., Pemble, M.E., Picardo, M., Pidgeon, C.R., Pinheiro, T.J.T., Poliakoff, E.D., Poole, M.W., Potts, A., Potvliege, R., Powis, I., Price, S.D., Quinn, F.M., Radford, S., Rachlew-Källne, E., Raval, R., Read, F.H., Reddish, T.J., Ridley, P.A., Roberts, G., Russell, A.E., Ryan, A.J., Sapelkin, A., Sato, S., Schneider, A., Seddon, E.A., Shaw, E.A., Shen, T., Sherwood, P., Šiller, L., Smith, A.D., Smith, D.A., Smith, I., Smith, S.L., Snowdon, K., Softley, T.P., Sokell, E., Southworth, S.H., Srivistava, G.P., Stankiewicz, M., Sule-Suso, J., Sutherland, J.C., Surman, M., Svensson, S., Taylor, A.O., Temmerman, W.M., Thomas, A., Tiddy, G.J., Tobin, M., Towns-Andrews, Elizabeth, Towrie, M., Truscott, G., Tuckett, R.P., Turner, Tracy, Twigg, M.V., Vagdama, P., van der Hart, H.W., Volk, M., Vrakkring, M.J.J., Walker, I.C., Wander, A., Wasserman, S.P., Watanabe, M., Weightman, P., Welton, T., West, J.B., Wharton, C.W., Whitehead, J.C., Williams, G.P., Winick, H., Withnall, R., Woodruff, D.P., and Zayats, A.

Subjects
Q1
Published
2001

29. The lower exosphere of Titan : Energetic neutral atoms absorption and imaging

Author

Garnier, P., Dandouras, I., Toublanc, D., Roelof, E. C., Brandt, P. C., Mitchell, D. G., Krimigis, S. M., Krupp, N., Hamilton, D. C., Dutuit, O., Wahlund, Jan Erik, Garnier, P., Dandouras, I., Toublanc, D., Roelof, E. C., Brandt, P. C., Mitchell, D. G., Krimigis, S. M., Krupp, N., Hamilton, D. C., Dutuit, O., and Wahlund, Jan Erik

Abstract

The Saturn magnetosphere interacts with the Titan atmosphere through various mechanisms. One of them leads, by charge exchange reactions between the energetic Saturnian ions and the exospheric neutrals of Titan, to the production of energetic neutral atoms (ENAs). The Ion and Neutral Camera (INCA), one of the three sensors that comprise the Magnetosphere Imaging Instrument (MIMI) on the Cassini/Huygens mission to Saturn and Titan, images the ENA emissions in the Saturnian magnetosphere. This study focuses on the ENA imaging of Titan (for 20-50 keV H ENAs), with the example of the Ta Titan flyby (26 October 2004): our objective is to understand the positioning of the ENA halo observed around Titan. Thus we investigate the main ENA loss mechanisms, such as the finite gyroradii effects for the parent ions, or the charge stripping with exospheric neutrals. We show that multiple stripping and charge exchange reactions have to be taken into account to understand the ENA dynamics. The use of an analytical approach, taking into account these reactions, combined with a reprocessing of the INCA data, allows us to reproduce the ENA images of the Ta flyby and indicates a lower limit for ENA emission around the exobase. However, the dynamics of energetic particle through the Titan atmosphere remains complex, with an inconsistency between the ENA imaging at low and high altitudes.

Published
2008
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32. PAHs molecules and heating of the interstellar gas

Author

Verstraete, Laurent, Leger, Alain, Dhendecourt, Louis B, Dutuit, O, and Defourneau, D

Subjects
Space Radiation
Abstract

Until now it has remained difficult to account for the rather high temperatures seen in many diffuse interstellar clouds. Various heating mechanisms have been considered: photoionization of minor species, ionization of H by cosmic rays, and photoelectric effect on small grains. Yet all these processes are either too weak or efficient under too restricting conditions to balance the observed cooling rates. A major heat source is thus still missing in the thermal balance of the diffuse gas. Using photoionization cross sections measured in the lab, it was shown that in order to balance the observed cooling rates in cold diffuse clouds (T approx. 80 K) the PAHs would have to contain 15 percent of the cosmic abundance of carbon. This value does not contradict the former estimation of 6 percent deduced from the IR emission bands since this latter is to be taken as a lower limit. Further, it was estimated that the contribution to the heating rate due to PAH's in a warm HI cloud, assuming the same PAH abundance as for a cold HI cloud, would represent a significant fraction of the value required to keep the medium in thermal balance. Thus, photoionization of PAHs might well be a major heat source for the cold and warm HI media.

Published
1989

34. TandEM: Titan and Enceladus mission

Author

Coustenis, A., primary, Atreya, S. K., additional, Balint, T., additional, Brown, R. H., additional, Dougherty, M. K., additional, Ferri, F., additional, Fulchignoni, M., additional, Gautier, D., additional, Gowen, R. A., additional, Griffith, C. A., additional, Gurvits, L. I., additional, Jaumann, R., additional, Langevin, Y., additional, Leese, M. R., additional, Lunine, J. I., additional, McKay, C. P., additional, Moussas, X., additional, Müller-Wodarg, I., additional, Neubauer, F., additional, Owen, T. C., additional, Raulin, F., additional, Sittler, E. C., additional, Sohl, F., additional, Sotin, C., additional, Tobie, G., additional, Tokano, T., additional, Turtle, E. P., additional, Wahlund, J.-E., additional, Waite, J. H., additional, Baines, K. H., additional, Blamont, J., additional, Coates, A. J., additional, Dandouras, I., additional, Krimigis, T., additional, Lellouch, E., additional, Lorenz, R. D., additional, Morse, A., additional, Porco, C. C., additional, Hirtzig, M., additional, Saur, J., additional, Spilker, T., additional, Zarnecki, J. C., additional, Choi, E., additional, Achilleos, N., additional, Amils, R., additional, Annan, P., additional, Atkinson, D. H., additional, Bénilan, Y., additional, Bertucci, C., additional, Bézard, B., additional, Bjoraker, G. L., additional, Blanc, M., additional, Boireau, L., additional, Bouman, J., additional, Cabane, M., additional, Capria, M. T., additional, Chassefière, E., additional, Coll, P., additional, Combes, M., additional, Cooper, J. F., additional, Coradini, A., additional, Crary, F., additional, Cravens, T., additional, Daglis, I. A., additional, de Angelis, E., additional, de Bergh, C., additional, de Pater, I., additional, Dunford, C., additional, Durry, G., additional, Dutuit, O., additional, Fairbrother, D., additional, Flasar, F. M., additional, Fortes, A. D., additional, Frampton, R., additional, Fujimoto, M., additional, Galand, M., additional, Grasset, O., additional, Grott, M., additional, Haltigin, T., additional, Herique, A., additional, Hersant, F., additional, Hussmann, H., additional, Ip, W., additional, Johnson, R., additional, Kallio, E., additional, Kempf, S., additional, Knapmeyer, M., additional, Kofman, W., additional, Koop, R., additional, Kostiuk, T., additional, Krupp, N., additional, Küppers, M., additional, Lammer, H., additional, Lara, L.-M., additional, Lavvas, P., additional, Le Mouélic, S., additional, Lebonnois, S., additional, Ledvina, S., additional, Li, J., additional, Livengood, T. A., additional, Lopes, R. M., additional, Lopez-Moreno, J.-J., additional, Luz, D., additional, Mahaffy, P. R., additional, Mall, U., additional, Martinez-Frias, J., additional, Marty, B., additional, McCord, T., additional, Menor Salvan, C., additional, Milillo, A., additional, Mitchell, D. G., additional, Modolo, R., additional, Mousis, O., additional, Nakamura, M., additional, Neish, C. D., additional, Nixon, C. A., additional, Nna Mvondo, D., additional, Orton, G., additional, Paetzold, M., additional, Pitman, J., additional, Pogrebenko, S., additional, Pollard, W., additional, Prieto-Ballesteros, O., additional, Rannou, P., additional, Reh, K., additional, Richter, L., additional, Robb, F. T., additional, Rodrigo, R., additional, Rodriguez, S., additional, Romani, P., additional, Ruiz Bermejo, M., additional, Sarris, E. T., additional, Schenk, P., additional, Schmitt, B., additional, Schmitz, N., additional, Schulze-Makuch, D., additional, Schwingenschuh, K., additional, Selig, A., additional, Sicardy, B., additional, Soderblom, L., additional, Spilker, L. J., additional, Stam, D., additional, Steele, A., additional, Stephan, K., additional, Strobel, D. F., additional, Szego, K., additional, Szopa, C., additional, Thissen, R., additional, Tomasko, M. G., additional, Toublanc, D., additional, Vali, H., additional, Vardavas, I., additional, Vuitton, V., additional, West, R. A., additional, Yelle, R., additional, and Young, E. F., additional

Published
2008
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35. Modelling the Venusian airglow

Author

Gronoff, G., primary, Lilensten, J., additional, Simon, C., additional, Barthélemy, M., additional, Leblanc, F., additional, and Dutuit, O., additional

Published
2008
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40. Prediction of a CO22+layer in the atmosphere of Mars

Author

Witasse, O., primary, Dutuit, O., additional, Lilensten, J., additional, Thissen, R., additional, Zabka, J., additional, Alcaraz, C., additional, Blelly, P.-L., additional, Bougher, S. W., additional, Engel, S., additional, Andersen, L. H., additional, and Seiersen, K., additional

Published
2002
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49. General discussion.

Author

Bowers, M. T., Leone, S. R., Eland, J. H. D., Koyano, I., Gislason, E. A., Henri, G., Lavollee, M., Dutuit, O., Ozenne, J. B., Guyon, P. M., Derrick, P. J., Murrell, J. N., Farrar, J. M., Levy, M. R., Holbrook, K. A., and Clary, D. C.

Published
1987
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50. A crossed-beam study of the dynamics of C<SUB>2</SUB>H<SUB>3</SUB><SUP>+</SUP> formation in the reaction of C<SUB>2</SUB>H<SUB>2</SUB><SUP>+</SUP> with methane

Author

&z.Zcaron;abka, J., Dutuit, O., Dolej&z.scaron;ek, Z., Polách, J., and Herman, Z.

Abstract

The formation of C2H3+ and its H/D isotopic variants in the reaction of C2H2+ with CH4 and CD4 was investigated in crossed-beam scattering experiments over the collision energy range 0.8 to 2.0 eV (centre of mass). Analysis of the scattering data shows that the product is formed simultaneously via decomposition of intermediates of two different average lifetimes; the mechanism of the process can be identified with two different pathways on the potential energy hypersurface. Formation of the long-lived intermediate (mean lifetime longer than 4 ps in the entire collision energy region) is interpreted as a reaction path involving intermediates of strongly bound C3H6+ isomers, and formation of the short-lived intermediate (mean lifetime decreases from about 2 ps to 0.3 ps with collision energy increasing from 0.8 to 2.0 eV) as a reaction path going through H-bonded intermediates (C2H2···H···CH3)+. At the collision energy of 2 eV the rate of decomposition of the short-lived intermediate is shown to be in effective competition with the rate of H/D isotope scrambling.

Published
2000

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