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Raman spectroscopy of diamond in ureilite and implication for the origin of diamond
Author(s) -
Miyamoto Masamichi,
Matsuda Junichi,
Ito Keisuke
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i012p01445
Subject(s) - diamond , meteorite , raman spectroscopy , diamond type , parent body , full width at half maximum , astrobiology , geology , materials science , analytical chemistry (journal) , mineralogy , material properties of diamond , chemistry , chondrite , optics , physics , optoelectronics , metallurgy , chromatography
Most ureilite meteorites contain diamonds that are generally thought to have been formed by shock‐induced high pressure that converted carbonaceous material to diamond. We measured Raman spectra of ureilite diamond in order to investigate the origin of such diamonds. The FWHM (full width at half maximum) of the Raman line at 1330 cm −1 from diamond in the ALH‐77257 ureilite is about 10 cm −1 which is narrower than those of artificially shock‐produced diamonds ( >20 cm −1 ) but within the range of vapor‐growth diamonds measured previously. This result suggests that the vapor‐growth origin of ureilite diamond in an interstellar environment should be considered seriously, although further studies are necessary to characterize vapor‐growth diamonds by measuring the Raman line of diamonds synthesized by various methods.