M. Famá

Balseiro Institute

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R. A. Baragiola

University of Virginia

B. D. Teolis

Southwest Research Institute

M. J. Loeffler

Northern Arizona University

U. Raut

Southwest Research Institute

R. A. Baragiola

University of Virginia

D. A. Bahr

University of Virginia

N. R. Arista

Institute of Astronomy and Space Physics

J. C. Eckardt

Bariloche Atomic Centre

G. H. Lantschner

Bariloche Atomic Centre

J. Shi

Inner Mongolia University

Cooperative Institutions

Centre National de la Recherche Scientifique

Consejo Nacional de Investigaciones Científicas y Técnicas

Sapienza University of Rome

Laboratoire AstroParticule et Cosmologie

Istituto Nazionale di Fisica Nucleare, Sezione di Roma I

Université Paris Cité

National University of Ireland, Maynooth

Southwest Research Institute

National University of General San Martín

Institut National de Physique Nucléaire et de Physique des Particules

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Correction to: SERENA: Particle Instrument Suite for Determining the Sun-Mercury Interaction from BepiColombo

Space Science Reviews (2021)

S. Orsini S. Livi Herbert Lichtenegger S. Barabash A. Milillo

Planetary science

Mercury

10.1007/s11214-021-00809-8

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Citations (7)

Negligible Contribution of Solar Wind Protons to Surficial Lunar Water: Laboratory Studies

41st Annual Lunar and Planetary Science Conference (2010)

Daren J. Burke C. A. Dukes M. Famá J. Kim J. K. Shi

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SPUTTERING FROM A POROUS MATERIAL BY PENETRATING IONS

The Astrophysical Journal Letters (2011)

Joaquin F. Rodriguez-Nieva Eduardo M. Bringa Timothy A. Cassidy R. E. Johnson A. Caro

Porous 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.

Nanoporous

10.1088/2041-8205/743/1/l5

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Citations (21)

The ion composition of Saturn's magnetosphere

cosp (2008)

D. B. Reisenfeld J. D. Williams R. A. Baragiola M. Famá Hilary R. Martens

Atmospheric Composition

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Citations (1)

Energy loss and angular dispersion of 2–200 keV protons in amorphous silicon

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2002)

M. Famá G. H. Lantschner J. C. Eckardt N. R. Arista J. E. Gayone

10.1016/s0168-583x(02)00732-2

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Radiolysis of water ice in the outer solar system: Sputtering and trapping of radiation products

Journal of Geophysical Research Atmospheres (2001)

D. A. Bahr M. Famá R. Vidal R. A. Baragiola

We performed quantitative laboratory radiolysis experiments on cubic water ice between 40 and 120 K, with 200 keV protons. We measured sputtering of atoms and molecules and the trapping of radiolytic molecular species. The experiments were done at fluences corresponding to exposure of the surface of the Jovian icy satellites to their radiation environment up to thousands of years. During irradiation, O 2 molecules are ejected from the ice at a rate that grows roughly exponentially with temperature; this behavior is the main reason for the temperature dependence of the total sputtering yield. O 2 trapped in the ice is thermally released from the ice upon warming; the desorbed flux starts at the irradiation temperature and increases strongly above 120 K. Several peaks in the desorption spectrum, which depend on irradiation temperature, point to a complex distribution of trapping sites in the ice matrix. The yield of O 2 produced by the 200 keV protons and trapped in the ice is more than 2 orders of magnitude smaller than used in recent models of Ganymede. We also found small amounts of trapped H 2 O 2 that desorb readily above 160 K.

10.1029/2000je001324

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Citations (60)

Atomic collisions in solids: Astronomical applications

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2002)

R. A. Baragiola C. L. Atteberry C. A. Dukes M. Famá B. D. Teolis

10.1016/s0168-583x(02)00893-5

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Citations (30)

Cosmic Ray Compaction of Porous Interstellar Ices

The Astrophysical Journal (2008)

U. Raut M. Famá M. J. Loeffler R. A. Baragiola

We studied the compaction of microporous vapor-deposited ice films under irradiation with different ions in the 80-400 keV energy range. We found that porosity decreases exponentially with irradiation fluence, with a mean compaction area per ion that scales linearly with the stopping power of the projectile S above a threshold St = 4 eV Å−1. The experiments roughly follow a universal dependence of ion-induced compaction with restricted dose (eV molecule−1). This behavior can be used to extrapolate our results to conditions of the interstellar medium. Relating our results to ionization rates of interstellar H2, we estimate that porous ice mantles on grains in dense molecular clouds are compacted by cosmic rays in ~10-50 million years.

Stopping power

10.1086/592193

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Citations (63)

Space Environments

Springer eBooks (2019)

M. Famá Jaime Estela

Space Radiation

Solar flare

Space environment

Space physics

Space Weather

10.1007/978-3-030-04660-6_1

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Citations (4)

Experimental Evidence of Threshold Effects in the Energy Loss of Protons in Carbon and Aluminum due to Inner Shell Ionization

Physical Review Letters (2000)

M. Famá J. C. Eckardt G. H. Lantschner N. R. Arista

We explore the contributions of inner shell ionization to the energy loss of 7 to 270 keV protons in C and Al foils under experimental conditions such that the product of the observation angle and the projectile energy is kept constant. By normalizing these energy loss measurements to the energy loss in the forward direction we observe a pronounced rising behavior with increasing energy. This effect appears in the same range of energies where the respective $K$- and $L$-shell ionization cross sections of these elements show a similar threshold behavior. Based also on various theoretical considerations we interpret these results as clear evidence of the inner shell ionization contribution to the energy loss.

Carbon fibers

10.1103/physrevlett.85.4486

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Citations (11)