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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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Baratta, Giuseppe
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Topics
Publications (10/10 displayed)
- 2016Wild 2 grains characterized combining MIR/FIR/Raman micro-spectroscopy and FE-SEM/EDS analyses
- 2011Formation of CO_2 and OCS after cosmic ion irradiation of icy grain mantles
- 2007Combined Micro-Infrared (IR) and Micro-Raman Measurements on Stratospheric Interplanetery Dust Particles
- 2004Raman spectroscopy of ion irradiated diamondcitations
- 2004Infrared and Raman spectroscopies of refractory residues left over after ion irradiation of nitrogen-bearing icy mixturescitations
- 2004A Raman study of ion irradiated icy mixturescitations
- 2004Raman and photoluminescence study of ion beam irradiated porous silicon: a case for the astrophysical extended red emission?citations
- 2003A Raman study of ion irradiated icy mixtures
- 2002Infrared and Raman spectroscopy of refractory residues left over after ion irradiation of nitrogen bearing icy mixtures
- 2000Laboratory and astronomical IR spectra: an experimental clue for their comparison
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article
A Raman study of ion irradiated icy mixtures
Abstract
We present a Raman study of pure CH_4, H_2O:CH_4:N_2 and CH_3OH:N_2 frozen films before and after ion irradiation at low (12 K) and high (100 K or 300 K) temperature. By means of Raman spectroscopy, we monitor the structural evolution of each film, whose optical properties are deeply modified by the interaction with the ion beam. Raman spectra show that the sample is partially converted into a refractory residue, which under further irradiation evolves towards an amorphous carbon with a band near 1560 cm<SUP>-1</SUP> (G line) and a shoulder at about 1360 cm<SUP>-1</SUP> (D line). The specific parameters of this 'double-peaked' feature (peaks position, widths and relative intensities) can be used as diagnostic to classify different carbonaceous materials and infer information about their degree of order.We have compared these parameters for our samples (ion irradiated frozen films and residues), for different kinds of hydrogenated carbon grains and for some IDPs. We have found that IDPs have in general a narrower G line, which peaks at higher wavenumbers, than most of the laboratory samples here discussed. This implies that IDPs have a structure with a higher degree of order than that of our samples.Here we present the experimenal results and discuss their relevance to the study of the origin and evolution of IDPs.