Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds
The first complete infrared FTIR absorption spectra for carbonado-diamond confirm the interstellar origin for the most enigmatic diamonds known as carbonado. All previous attempts failed to measure the absorption of carbonado-diamond in the most important IR-range of 1000-1300 cm{sup -1} (10.00-7.69 {mu}m) because of silica inclusions. In our investigation, KBr pellets were made from crushed silica-free carbonado-diamond and thin sections were also prepared. The 100 to 1000 times brighter synchrotron infrared radiation permits a greater spatial resolution. Inclusions and pore spaces were avoided and/or sources of chemical contamination were removed. The FTIR spectra of carbonado-diamond mostly depict the presence of single nitrogen impurities, and hydrogen. The lack of identifiable nitrogen aggregates in the infrared spectra, the presence of features related to hydrocarbon stretch bonds, and the resemblance of the spectra to CVD and presolar diamonds indicate that carbonado-diamonds formed in a hydrogen-rich interstellar environment. This is consistent with carbonado-diamond being sintered and porous, with extremely reduced metals, metal alloys, carbides and nitrides, light carbon isotopes, surfaces with glassy melt-like patinas, deformation lamellae, and a complete absence of primary, terrestrial mineral inclusions. The 2.6-3.8 billion year old fragmented body was of asteroidal proportions.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 929852
- Report Number(s):
- BNL-80417-2008-JA; ASJOAB; TRN: US0806658
- Journal Information:
- Astrophysical Journal, Vol. 653; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
43 PARTICLE ACCELERATORS
ABSORPTION
ABSORPTION SPECTRA
ALLOYS
CARBIDES
CARBON ISOTOPES
DEFORMATION
DIAMONDS
HYDROCARBONS
HYDROGEN
IMPURITIES
INCLUSIONS
INFRARED RADIATION
INFRARED SPECTRA
LAMELLAE
METALS
MINERALS
NITRIDES
NITROGEN
ORIGIN
PELLETS
SILICA
SPATIAL RESOLUTION
SPECTRA
SURFACES
SYNCHROTRON RADIATION
VISIBLE RADIATION
national synchrotron light source