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Title: Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds

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{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.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
929852
Report Number(s):
BNL-80417-2008-JA
Journal ID: ISSN 0004-637X; ASJOAB; TRN: US0806658
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 653
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 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

Citation Formats

Garai,J., Haggerty, S., Rekhi, S., and Chance, M. Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds. United States: N. p., 2007. Web.
Garai,J., Haggerty, S., Rekhi, S., & Chance, M. Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds. United States.
Garai,J., Haggerty, S., Rekhi, S., and Chance, M. Mon . "Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds". United States. doi:.
@article{osti_929852,
title = {Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds},
author = {Garai,J. and Haggerty, S. and Rekhi, S. and Chance, M.},
abstractNote = {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.},
doi = {},
journal = {Astrophysical Journal},
number = ,
volume = 653,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}