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Sputtering from a Porous Material by Penetrating IonsPorous materials are ubiquitous in the universe and weathering of porous surfaces plays an important role in the evolution of planetary and interstellar materials. Sputtering of porous solids in particular can influence atmosphere formation, surface reflectivity, and the production of the ambient gas around materials in space, Several previous studies and models have shown a large reduction in the sputtering of a porous solid compared to the sputtering of the non-porous solid. Using molecular dynamics simulations we study the sputtering of a nanoporous solid with 55% of the solid density. We calculate the electronic sputtering induced by a fast, penetrating ion, using a thermal spike representation of the deposited energy. We find that sputtering for this porous solid is, surprisingly, the same as that for a full-density solid, even though the sticking coefficient is high.
Document ID
20120017340
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Rodriguez-Nieva, J. F.
(Universidad Nacional de Cuyo San Carlos de Bariloche, Argentina)
Bringa, E. M.
(Universidad Nacional de Cuyo Mendoza, Argentina)
Cassidy, T. A.
(California Inst. of Tech. Pasadena, CA, United States)
Johnson, R. E.
(Virginia Univ. Charlottesville, VA, United States)
Caro, A.
(Los Alamos National Lab. NM, United States)
Fama, M.
(Virginia Univ. Charlottesville, VA, United States)
Loeffler, M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Baragiola, R. A.
(Virginia Univ. Charlottesville, VA, United States)
Farkas, D.
(Virginia Tech Blacksburg, VA, United States)
Date Acquired
August 25, 2013
Publication Date
December 10, 2012
Publication Information
Publication: The Astrophysical Journal Letters
Volume: 743
Issue: 1
Subject Category
Space Sciences (General)
Report/Patent Number
GSFC.JA.7459.2012
Funding Number(s)
CONTRACT_GRANT: PICT2009-0092
Distribution Limits
Public
Copyright
Other

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