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- W1640812498 abstract "Introduction: Tagish Lake, a carbonaceous chondrite C2, fell on 18th January 2000 in Canada. According to [1], the meteorite contains about 3650–4330 (ppm) of nanodiamonds, while inferred from measurements of xenon [2] the abundance is 18002500 ppm. This is the highest nanodiamond abundance reported from chondrites. Raman spectroscopic signatures of separated nanodiamonds have been studied in the work presented here. Samples and Experiments: Nanodiamonds were separated following established procedures [3] Raman spectra have been recorded using the confocal Raman micro-spectrometer T-64000 (Jobin-Yvon) with Argon line λ=514.5 nm. Results: The spectra show a diamond peak at 1329 cm (FWHM of about 50 cm) and a broad peak around 1600 cm (Fig.1) [4]. Previous investigations of Allende meteorite presolar nanodiamonds showed peaks at 1326 cm and 1590 cm [5] what is in agreement of laboratory manufactured nanodiamonds Raman investigations [6]. Shifts of diamond peak positions (monocrystalline cubic diamond has Raman peak at 1332 cm) occur because of the nanometer crystal sizes [6] or because of different polytypes [7] of diamond occuring in the sample. References: [1] Grady M. M. et al. (2002) Meteoritics & Planetary Science 37:713-735. [2] Jakubowski T. et al. (2011) Goldschmidt 2011, Abstract #2944. [3] Amari S. et al. (1994) Geochimica et Cosmochimica Acta 58:459-470. [4] Jakubowski T. (2011) PhD thesis, Technical University of Lodz. [5] Gucsik A. et al. (2008) Proceedings of the IAU Symposium 251 “Organic Matter in Space”:335-339. [6] Osswald S. et al. (2009) Physical Review B 80:075419. [7] Phelps A.W. (1999) Lunar and Planetary Science, #1749." @default.
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- W1640812498 date "2011-09-01" @default.
- W1640812498 modified "2023-09-25" @default.
- W1640812498 title "Raman Spectroscopy Investigations of Tagish Lake Nanodiamonds" @default.
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