| People | Locations | Statistics |
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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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Remusat, Laurent
French National Centre for Scientific Research
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2023Combination of ERDA, FTIR spectroscopy and NanoSIMS for the characterization of hydrogen incorporation in natural diamondscitations
- 2018Kinetic D/H fractionation during hydration and dehydration of silicate glasses, melts and nominally anhydrous mineralscitations
- 2018Long-term weathering rate of stained-glass windows using H and O isotopescitations
- 2016The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basementcitations
- 2014Isotopic and structural signature of experimentally irradiated organic mattercitations
- 2013Amorphization and D/H fractionation of kerogens during experimental electron irradiation: Comparison with chondritic organic mattercitations
- 2013Amorphization and D/H fractionation of kerogens during experimental electron irradiation: Comparison with chondritic organic mattercitations
- 2012High resolution TEM of chondritic carbonaceous matter: Metamorphic evolution and heterogeneitycitations
Places of action
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article
Isotopic and structural signature of experimentally irradiated organic matter
Abstract
The effects of electron irradiation on the structure and the D/H signature of a synthetic analogue of extraterrestrialinsoluble organic matter (IOM) were studied. Polyethylene terephthalate (PET) was chosen because it contains both aliphaticand aromatic functional groups. A 900 nm-thick film was irradiated with electrons within the energy range 4–300 keV, fordifferent run durations. Temperature influence was also tested. Irradiated residues were structurally and isotopically characterizedby infrared spectroscopy (IR), electronic paramagnetic resonance (EPR), and Secondary Ion Mass Spectrometry(SIMS). With increasing energy deposition, spectroscopic results indicate (i) a gradual amorphization with chain scissions,(ii) an increase of CH2/CH3 and (iii) the formation of quinones. The EPR study shows that mono- and biradicals (organicspecies with one or several unpaired valence electrons) are also formed during irradiation. As these structural modificationsoccur, the dD (initially at 33& relative to SMOW) decreases first during a transient step and then stabilizes at +300&.There is a strong correlation between the changes recorded by the different methods and the electron dose. Deposited energyappears to be the key parameter to induce these modifications. In this respect a low-energy electron irradiation causes moredamages than high energy ones. Based on our data and considering the current solar electron flux, the irradiation at moderateenergy (1–10 keV) can produce significant D-enrichments of the IOM in a timescale compatible with the evolution of a typicalprotoplanetary disk