A micro-Raman survey of 10 IDPs and 6 carbonaceous chondrites |
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Authors: | Eric Quirico Janet Borg Pierre-Ivan Raynal Gilles Montagnac Louis dHendecourt |
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Institution: | aLaboratoire de Planétologie de Grenoble, Bâtiment D de Physique, B.P. 53 38041 Grenoble Cedex 9, France;bInstitut d’Astrophysique Spatiale, Bâtiment 121, Université Paris-Sud, 91405 Orsay Cedex, France;cLaboratoire des Sciences de la Terre, Ecole Normale Supérieure de Lyon, 46, Allée d’Italie, 69364 Lyon Cedex 07, France |
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Abstract: | This paper presents a micro-Raman survey of a set of 10 IDPs and 6 pristine carbonaceous chondrites. The higher sensitivity of the present micro-spectrometers allowed to record a dozen of spectra for each objects, whereas only one was available in previous studies. First, as in previous studies, the first-order carbon bands G and D were the only detected features, superimposed onto a fluorescence background of variable intensity, and the spectral characteristics of these bands point to a very disordered polyaromatic organic matter (OM). Nevertheless, these new data reveal that in IDPs, unlike chondrites, the presence of the Raman bands is not systematic, evidencing a much higher heterogeneity in the spatial distribution or the chemical composition of OM. Second, as a consequence, a single spectrum is not representative of a whole IDP, and the classification previously proposed by Wopenka 1988. Raman observations on individual interplanetary dust particules. Earth and Planet. Sci. Lett. 88, 221—231.] is no longer tenable. At last, this study shows that the fluorescence signal induced by the laser irradiation mostly originates from OM. |
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Keywords: | Organic matter Stratospheric IDPs Chondrites Raman spectroscopy Comets |
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