dorsal/arxiv
View SchemaInfrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado-Diamonds
| Authors | Jozsef Garai, Stephen E. Haggerty, Sandeep Rekhi, Mark Chance |
|---|---|
| Categories | |
| ArXiv ID | physics/0608014 |
| URL | https://arxiv.org/abs/physics/0608014 |
| DOI | 10.1086/510451 |
| Journal | Astrophys.J.653:L153-L156,2006 |
Abstract
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-1 (10.00-7.69 micro-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.
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"abstract": "The first complete infrared FTIR absorption spectra for carbonado-diamond\nconfirm the interstellar origin for the most enigmatic diamonds known as\ncarbonado. All previous attempts failed to measure the absorption of\ncarbonado-diamond in the most important IR-range of 1000-1300 cm-1 (10.00-7.69\nmicro-m.) because of silica inclusions. In our investigation, KBr pellets were\nmade from crushed silica-free carbonado-diamond and thin sections were also\nprepared. The 100 to 1000 times brighter synchrotron infrared radiation permits\na greater spatial resolution. Inclusions and pore spaces were avoided and/or\nsources of chemical contamination were removed. The FTIR spectra of\ncarbonado-diamond mostly depict the presence of single nitrogen impurities, and\nhydrogen. The lack of identifiable nitrogen aggregates in the infrared spectra,\nthe presence of features related to hydrocarbon stretch bonds, and the\nresemblance of the spectra to CVD and presolar diamonds indicate that\ncarbonado-diamonds formed in a hydrogen-rich interstellar environment. This is\nconsistent with carbonado-diamond being sintered and porous, with extremely\nreduced metals, metal alloys, carbides and nitrides, light carbon isotopes,\nsurfaces with glassy melt-like patinas, deformation lamellae, and a complete\nabsence of primary, terrestrial mineral inclusions. The 2.6-3.8 billion year\nold fragmented body was of asteroidal proportions.",
"arxiv_id": "physics/0608014",
"authors": [
"Jozsef Garai",
"Stephen E. Haggerty",
"Sandeep Rekhi",
"Mark Chance"
],
"categories": [
"physics.space-ph",
"astro-ph"
],
"doi": "10.1086/510451",
"journal_ref": "Astrophys.J.653:L153-L156,2006",
"title": "Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado-Diamonds",
"url": "https://arxiv.org/abs/physics/0608014"
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