Other
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35...75b&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 1, pp. 75-84 (2000).
Other
23
Scientific paper
Infrared and ultraviolet absorption spectra were obtained for diamonds from the Allende and Murchison meteorites. In addition, and for the first time, electron paramagnetic resonance spectra were measured. The IR and UV data confirm the suspicion of Russell et al. (1996) that nitrogen in presolar diamonds predominantly appears in form of dispersed nitrogen atoms, as it is the case for terrestrial type Ib diamonds. In accordance with other observations, our electron paramagnetic resonance measurements suggest a high hydrogen content in presolar diamonds. The presolar diamonds most likely originated in a hydrogen-rich region, an environment in which nanometer-sized diamonds may be more stable than graphite (Badziag et al., 1990). This adds to the evidence - previously based mainly on the twin microstructures of presolar diamonds (Daulton et al., 1996) and the absence of graphite with the same isotopic composition as presolar diamonds (Anders and Zinner, 1993) - for a homogeneous nucleation of presolar diamonds from a gas phase. Based on our results, for detection of diamonds in space, we suggest to search for the nitrogen-induced infrared and ultraviolet absorption features of type Ib diamonds. Other characteristic diamond features which could also be used to detect diamonds in space are: The (-CHn) infrared absorption features due to hydrogen coated diamonds, as they are described by Allamandola et al. (1993) and the infrared multiphonon absorption features of the diamond lattice. The multiphonon features are very weak (Edwards, 1985), but their intensity increases somewhat with increasing temperature (Collins and Fan, 1954), so perhaps a search for them is not totally hopeless.
Braatz A.
Henning Th
Jäger Cornelia
Jeschke Gunnar
Ott Ulrich
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