Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds

  title={Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado Diamonds},
  author={Jozsef Garai and Stephen E. Haggerty and Sandeep Rekhi and Mark R. Chance},
  journal={The Astrophysical Journal Letters},
  pages={L153 - L156}
The first complete infrared FTIR absorption spectra of carbonado diamond confirm the interstellar origin of this most enigmatic diamond. 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 μm) because of silica inclusions. In our investigation, KBr pellets were made from crushed silica-free carbonado diamond, and thin sections were also prepared. The 100-1000 times brighter synchrotron infrared radiation… 
Infrared and Raman spectroscopic observations of Central African carbonado and implications for its origin
Carbonado diamonds from the Central African Republic (CAR) were investigated using spectroscopic observations. Raman spectra for a polished section of carbonado showed the average Raman frequency as
Hydrous fluid as the growth media of natural polycrystalline diamond, carbonado: Implication from IR spectra and microtextural observations
Abstract Carbonado, a variety of natural polycrystalline diamond whose origin remains unknown, differs notably in the properties from common diamonds of mantle origin. In this study, infrared
The origin of hydrocarbons in fluid inclusions in diamonds
Introduction Fibrous cuboid diamonds with fluid inclusions and carbonado diamonds have been reported to contain hydrocarbons. They were detected by characteristic C-H peaks between 2800 and 3000 cm
Morphology and defects of diamond grains in carbonado: clues to carbonado genesis
The morphology and defects in diamond grains comprising Brazilian carbonado have been investigated using X-ray diffraction, photo- and X-ray luminescence, electron paramagnetic resonance and Raman
Ionized nitrogen mono‐hydride bands are identified in the presolar and carbonado diamond spectra
Abstract– None of the well‐established nitrogen‐related IR absorption bands, common in synthetic and terrestrial diamonds, have been identified in the presolar diamond spectra. In the carbonado
Relationships between textural and photoluminescence spectral features of carbonado (natural polycrystalline diamond) and implications for its origin
Field Emission SEM (FESEM) textural observations, crystal size distribution (CSD) analyses, UV-excited luminescence imaging, and photoluminescence (PL) microspectroscopy excited by 488 nm laser were
The scattering and extinction properties of nanodiamonds
The study of the scattering and extinction properties of possible nanodiamond grains in the interstellar medium (ISM) are reported. Calculations using the discrete dipole approximation (DDA) for
Hydrogen isotope compositions in carbonado diamond: constraints on terrestrial formation
Abstract In this study we report the first hydrogen isotope composition analyses on carbonado diamond along with cathodoluminescence and scanning electron microscopic imaging, electron microprobe
Petrogenesis of mineral micro-inclusions in an uncommon carbonado
A unique Brazilian sample of a carbonado, displaying unusually large amount of diamond clasts merged within a fine-grained diamond matrix, has been studied by Secondary Ion Mass Spectrometry (SIMS),


Evolution of Carbon Dust in Aromatic Infrared Emission Sources: Formation of Nanodiamonds
Particles of crystalline diamond showing extremely narrow (4-6 cm-1) IR absorption features attributable to tertiary CH groups have been prepared in the laboratory by deposition of hydrogenated
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Infrared spectroscopy of interstellar nanodiamonds from the Orgueil meteorite
Abstract— We present results from an ongoing study of the infrared (IR) and optical properties of nanodiamonds, an objective of which is to identify spectral features in the laboratory that could
Geologically Significant Information from Routine Analysis of the Mid-Infrared Spectra of Diamonds
Availability of infrared (IR) microscopes has made it possible to obtain absorption spectra from microdiamonds or from small areas of larger diamonds. Analysis of the envelopes of the one-phonon
Facts and Artifacts in Interstellar Diamond Spectra
Absorption spectra of presolar diamonds extracted from the Murchison meteorite have been measured in the extended wavelength range 0.2-500 μm in order to make available optical properties of this
Aggregate nitrogen in synthetic diamond
Nitrogen is a commonly observed impurity in natural and synthetic diamond, yet there are still many questions in regard to its incorporation in the material. In all three common forms of diamond:
Diamond Infrared Emission Bands in Circumstellar Media
Since the discovery of small diamond grains in meteorites, the presence of such grains in the interstellar medium has been suspected. Here we report what we think to be the first unambiguous evidence
The kinetics of the aggregation of nitrogen atoms in diamond
  • T. Evans, Zengdu Qi
  • Geology
    Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
  • 1982
Most natural diamonds contain nitrogen as the main impurity. In some rare diamonds (termed type lb) the nitrogen is mainly present as single substitutional atoms. However, the large majority of
Surface C-H stretching features on meteoritic nanodiamonds
Nanometre-sized diamonds (nanodiamonds) are to date the most abundant presolar grains in primitive meteorites. They are therefore presumed to be an abundant component of the dust in the interstellar