Laboratory studies on the sputtering contribution to the sodium atmospheres of Mercury and the Moon |
| |
| Authors: | Catherine A Dukes Wen-Yen Chang Marcelo Famá Raúl A Baragiola |
| |
| Institution: | 1. Dept. of Earth and Planetary Sciences, Division of Physical Sciences, American Museum of Natural History, New York 10024, USA;2. Physikalisches Institut, University of Bern, Bern, Switzerland;3. Austrian Academy of Sciences, Graz, Austria;4. Swedish Institute of Space Physics, Kiruna, Sweden;5. Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France;1. Institute of Planetary Research, German Aerospace Center (DLR), 14489, Berlin, Germany;2. Istituto Nazionale di AstroFisica – Istituto di Astrofisica e Planetologia Spaziali (INAF-IAPS), Via del Fosso del Cavaliere 100, 00133, Rome, Italy;3. Southwest Research Institute, 6220 Culebra Road, San Antonio, TX, 78238, USA;4. Università degli Studi di Napoli “Parthenope”, Napoli, Italy;5. Institut d’Astrophysique Spatiale, Univ. Paris Sud / CNRS, Bat. 121, Orsay Campus, 91405, Orsay, France;6. The Swedish Institute of Space Physics, Box 812, SE-981 28, Kiruna, Sweden;7. Università degli Studi di Trento, Via Sommarive, 9 I-38123, Trento, Italy;8. Imperial College London, United Kingdom;9. Joint Institute for VLBI ERIC, Oude Hoogeveensedijk 4, 7991 PD, Dwingeloo, the Netherlands;10. Department of Astrodynamics and Space Missions, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, the Netherlands;11. Max-Planck-Institut für Sonnensystemforschung, Germany;12. University La Sapienza of Rome, via Eudossiana 18, 00186, Roma, Italy;13. Swedish Institute of Space Physics, Box 537, 751 21, Uppsala, Sweden;14. Universität Bern, Physikalisches Institut, Weltraum und Planetologie, Sidlerstr. 5, 3012, Bern, Switzerland;15. European Space Research and Technology Centre (ESTEC), European Space Agency (ESA), 2200 AG, Noordwijk, Netherlands;p. Laboratoire de Planétologie et Géodynamique, UMR-CNRS 6112, Université de Nantes, BP 92208, 44322, Nantes Cedex 3, France;q. Laboratoire d’Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, Allée Georoy Saint-Hilaire, 33615, Pessac, France;r. LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, Meudon, France;s. Free University Berlin, Planetary Science and Remote Sensing, Malteserstr. 74-100, 12249, Berlin, Germany;t. INAF-Osservatorio Astronomico di Padova, Vicolo dell'' Osservatorio 5, 35122, Padova, Italy;u. California Institute of Technology, Pasadena, CA, 91125, USA;v. RHEA group for ESA/ESAC, 28, Villanueva de la Cañada, 28692, Madrid, Spain;w. Royal Observatory of Belgium, Brussels, Belgium;x. Instituut voor Sterrenkunde, KU Leuven, Belgium |
| |
| Abstract: | To ascertain the importance of sputtering by solar wind ions on the formation of a sodium exosphere around Mercury and the Moon, we have irradiated with 4 keV He ions, the Na bearing tectosilicates: albite, labradorite, and anorthoclase, as well as adsorbed Na layers deposited on albite and on olivine (a neosilicate that does not contain Na). Sodium at the surface and near surface (<40 Å) was quantified with X-ray photoelectron spectroscopy before and after each irradiation to determine the depletion cross section. We measured a cross section for sputtering of Na adsorbed on mineral surfaces, σs ≈ 1 × 10?15 cm2 atom?1. In addition, mass spectrometric analyses of the sputtered flux show that a large fraction of the Na is sputtered as ions rather than as neutral atoms. These results have strong implications for modeling the sodium population within the mercurian and the lunar exospheres. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
