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A micro-Raman survey of 10 IDPs and 6 carbonaceous chondrites

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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Eric Quirico, Janet Borg, Pierre-Ivan Raynal, Gilles Montagnac, Louis d'Hendecourt. A micro-Raman survey of 10 IDPs and 6 carbonaceous chondrites. Planetary and Space Science, Elsevier, 2005, 53 (14-15), pp.1443-1448. ⟨10.1016/j.pss.2005.07.009⟩. ⟨insu-00356465⟩



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