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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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Briois, Christelle
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2020Electrical properties of cometary dust particles derived from line shapes of TOF-SIMS spectra measured by the ROSETTA/COSIMA instrumentcitations
- 2020Electrical properties of cometary dust particles derived from line shapes of TOF-SIMS spectra measured by the ROSETTA/COSIMA instrumentcitations
- 2015Scenarios for distributed sources of formaldehyde in the atmosphere of comet 67P/Churyumov-Gerasimenko
- 2015COSIMA-Rosetta calibration for in situ characterization of 67P/Churyumov-Gerasimenko cometary inorganic compoundscitations
- 2010On the detection of polyxymethylene with the Rosetta/COSIMA instrument
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document
On the detection of polyxymethylene with the Rosetta/COSIMA instrument
Abstract
Polyoxymethylene (POM : -(CH2 -O)n-) has been proposed as a parent compound to explain the density profile of formaldehyde (H2 CO) in comets. Indeed the production rate of H2 CO cannot be interpreted by its direct sublimation from nucleus ices. It shows a distributed source. However, the thermal degradation of POM in the solid state on grains ejected from the nucleus is a consistent scenario to adjust observations and modeling of the chemistry of formaldehyde in cometary atmosphere (Cottin et al, 2004; Fray et al, 2006). Nevertheless POM has never been detected in a comet. Infrared and visible spectroscopies are useless for its detection: for instance it shows the same spectral feature than the silicates at 10µm (Vanysek & Wickramasinghe, 1975). In addition to being a good candidate as a parent compound for the distributed source of H2 CO, POM can be synthesized during UV photolysis and thermal process of interstellar or cometary laboratory ice analogs (Bernstein et al., 1995; Shutte et al., 1993a, 1993b). Therefore polyoxymethylene is a key compound to be looked for with the ROSETTA instruments. COSIMA (Cometary Secondary Ion Mass Analyser) is a time of flight secondary ion mass spec-trometer (TOF SIMS), onboard the Rosetta spacecraft. COSIMA will analyze cometary grains in order to determine their elemental, isotopic and molecular composition. The cometary grains will be collected on metallic targets exposed to the dust tail (Kissel et al, 2007). In this presen-tation, we will discuss the extent to which COSIMA will be able to detect polyoxymethylene. We will study this question by measuring the mass spectrum of POM using a ground analog of COSIMA, and by modeling the lifetime of this polymer on cometary grains collected on metallic target. References : Cottin H. et al. (2004) Icarus 167, 397-416 ; Fray N. et al. (2006) Icarus 184, 239-254 ; Vanysek V. & Wickramasinghe N.C. (1975) Astrophys. Space Sci. 33, L19-L28; Bernstein M.P. et al (1995) ApJ 454, 327-344 ; Shutte W.A. et al. (1993a) Science 259, 1143-1145 ; Shutte W.A. et al. (1993b) Icarus 104, 118-137 ; Kissel J. et al. (2007) Space Sci. Rev. 128, 823-867...