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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Jones, Anthony
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2021BEDE: Bayesian estimates of dust evolution for nearby galaxiescitations
- 2015Amorphous Hydrocarbon Optical Properties
- 2015Dust variations in the diffuse interstellar medium: constraints on Milky Way dust from Planck-HFI observationscitations
- 2014A hidden reservoir of Fe/FeS in interstellar silicates?citations
- 2013The Circle of Dust: From Nanoparticles to Macromolecules and Beyond
- 2013Heteroatom-doped hydrogenated amorphous carbons, a-C:H:X. "Volatile" silicon, sulphur and nitrogen depletion, blue photoluminescence, diffuse interstellar bands and ferro-magnetic carbon grain connectionscitations
- 2013On the Excitation and Formation of Circumstellar Fullerenes
- 2013Photoprocessing-driven dust evolution in the diffuse ISM
- 2012Variations on a theme - the evolution of hydrocarbon solids. I. Compositional and spectral modelling - the eRCN and DG modelscitations
- 2012Variations on a theme - the evolution of hydrocarbon solids. II. Optical property modelling - the optEC<SUB>(s)</SUB> modelcitations
- 2012Variations on a theme - the evolution of hydrocarbon solids. III. Size-dependent properties - the optEC<SUB>(s)</SUB>(a) modelcitations
- 2009The Cycle of Carbon Dust in the ISM
- 2008Carbonaceous dust in interstellar shock waves: hydrogenated amorphous carbon (a-C:H) vs. graphitecitations
- 2007IRAS 08572+3915: constraining the aromatic versus aliphatic content of interstellar HACscitations
- 2007Ferromagnetic inclusions in silicate thin films: insights into the magnetic properties of cosmic grainscitations
- 2006The origin of GEMS in IDPs as deduced from microstructural evolution of amorphous silicates with annealingcitations
- 2004Laboratory Studies of the Ion-irradiation of Dust Analogs: Application to the Evolution of Interstellar Silicates
- 2002Temperature-dependent FIR/sub-mm dust emissivity indices: some implications for the diffuse ISM dust compositioncitations
- 2001Structural and chemical alteration of crystalline olivine under low energy He<SUP>+</SUP> irradiationcitations
- 2000The formation and reformation of interstellar dust.
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article
Structural and chemical alteration of crystalline olivine under low energy He<SUP>+</SUP> irradiation
Abstract
We present the results of irradiation experiments on crystalline olivine with He<SUP>+</SUP> ions at energies of 4 and 10 keV and fluences varying from 5 10<SUP>16</SUP> to 10<SUP>18</SUP> ions/cm<SUP>2</SUP>. The aim of these experiments is to simulate ion implantation into interstellar grains in shocks in the ISM. Irradiated samples were analysed by transmission electron microscopy (TEM). The irradiation causes the amorphization of the olivine, at all He<SUP>+</SUP> fluences considered. The thickness of the amorphized region is 40 +/- 15 nm and 90 +/- 10 nm for the 4 keV and 10 keV experiments, respectively. The amorphization of the olivine occurs in conjunction with an increase in the porosity of the material due to the formation of bubbles. In addition, the amorphized layer is deficient in oxygen and magnesium. We find that the O/Si and Mg/Si ratios decrease as the He<SUP>+</SUP> fluence increases. These experiments show that the irradiation of dust in supernova shocks can efficiently alter the dust structure and composition. Our result are consistent with the lack of crystalline silicates in the interstellar medium and also with the compositional evolution observed from olivine-type silicates around evolved stars to pyroxene-type silicates around protostars....