# Mixed aromatic–aliphatic organic nanoparticles as carriers of unidentified infrared emission features

@article{Kwok2011MixedAO,
title={Mixed aromatic–aliphatic organic nanoparticles as carriers of unidentified infrared emission features},
author={S. Kwok and Y. Zhang},
journal={Nature},
year={2011},
volume={479},
pages={80-83}
}
• Published 2011
• Chemistry, Medicine
• Nature
Unidentified infrared emission bands at wavelengths of 3–20 micrometres are widely observed in a range of environments in our Galaxy and in others. Some features have been identified as the stretching and bending modes of aromatic compounds, and are commonly attributed to polycyclic aromatic hydrocarbon molecules. The central argument supporting this attribution is that single-photon excitation of the molecule can account for the unidentified infrared emission features observed in ‘cirrus… Expand
199 Citations

#### Paper Mentions

The Carriers of the Interstellar Unidentified Infrared Emission Features: Aromatic or Aliphatic?
• Physics
• 2012
The unidentified infrared emission (UIE) features at 3.3, 6.2, 7.7, 8.6, and 11.3 {mu}m, commonly attributed to polycyclic aromatic hydrocarbon (PAH) molecules, have been recently ascribed to coal-Expand
On the aliphatic versus aromatic content of the carriers of the ‘unidentified’ infrared emission features
• Physics
• 2016
Although it is generally accepted that the so-called "unidentified" infrared emission (UIE) features at 3.3, 6.2, 7.7, 8.6, and 11.3 micrometer are characteristic of the stretching and bendingExpand
UNIDENTIFIED INFRARED EMISSION BANDS: PAHs or MAONs?
• Physics
• 2013
We suggest that the carrier of the unidentified infrared emission (UIE) bands is an amorphous carbonaceous solid with mixed aromatic/aliphatic structures, rather than free-flying polycyclic aromaticExpand
On the Origin of the 11.3 Micron Unidentified Infrared Emission Feature
• Physics
• 2015
The 11.3 µm emission feature is a prominent member of the family of unidentified infrared emission (UIE) bands and is frequently attributed to out-of-plane bending modes of polycyclic aromaticExpand
On the Origin of the 3.3 Micron Unidentified Infrared Emission Feature
• Physics
• 2017
The 3.3 $\mu$m unidentified infrared emission feature is commonly attributed to C-H stretching band of aromatic molecules. Astronomical observations have shown that this feature is composed of twoExpand
Nitrogen-included Carbonaceous Compounds (NCC): Laboratory-synthesized organics as the probable candidate for the carrier of the UIR bands observed in dusty classical novae
• I. Endo, +7 authors Y. Kebukawa
• Materials Science
• Proceedings of the International Astronomical Union
• 2018
Abstract The unidentified infrared (UIR) bands have been ubiquitously observed in various astrophysical environments and consist of a series of emission features arising from aromatic and/orExpand
Mixed Aromatic Aliphatic Organic Nanoparticles (MAON) as Carriers of Unidentified Infrared Emission Bands
• Chemistry
• Proceedings of the International Astronomical Union
• 2018
The unidentified infrared emission (UIE) phenomenon consists of a family of emission bands and broad emission plateaus superimposed on an underlying continuum. The most popular explanation for theExpand
The carriers of the unidentified infrared emission features: Clues from polycyclic aromatic hydrocarbons with aliphatic sidegroups
• Physics
• 2017
Abstract The unidentified infrared emission (UIE) features at 3.3, 6.2, 7.7, 8.6, 11.3 and 12.7  µ m are ubiquitously seen in a wide variety of astrophysical regions in the Milky Way and nearbyExpand
Random mixtures of polycyclic aromatic hydrocarbon spectra match interstellar infrared emission
• Physics
• 2014
The mid-infrared (mid-IR; 5–15 μm) spectrum of a wide variety of astronomical objects exhibits a set of broad emission features at 6.2, 7.7, 8.6, 11.3, and 12.7 μm. About 30 years ago it was proposedExpand
The 217.5 nm Band, Infrared Absorption, and Infrared Emission Features in Hydrogenated Amorphous Carbon Nanoparticles
• Physics
• 2012
We report on the preparation of hydrogenated amorphous carbon nanoparticles whose spectral characteristics include an absorption band at 217.5 nm with the profile and characteristics of theExpand

#### References

SHOWING 1-10 OF 39 REFERENCES
The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction
We have obtained new Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra to search for structure in the ultraviolet interstellar extinction curve, with particular emphasis on a searchExpand
Interstellar polycyclic aromatic hydrocarbons: the infrared emission bands, the excitation/emission mechanism, and the astrophysical implications.
• Physics, Medicine
• The Astrophysical journal. Supplement series
• 1989
The spectroscopic structure these PAHs and PAH-related materials produce in the UV portion of the interstellar extinction curve lie just below current detection limits but fall in the range detectable by the Hubble Space Telescope. Expand
Interstellar Polycyclic Aromatic Hydrocarbon Molecules
Large polycyclic aromatic hydrocarbon (PAH) molecules carry the infrared (IR) emission features that dominate the spectra of most galactic and extragalactic sources. This review surveys the observedExpand
Small Grains and Large Aromatic Molecules
• Materials Science
• 1991
Recently, the interpretation of the so-called “unidentified” infrared emission bands has drastically improved. These bands are attributed to the fundamental vibrations of large molecules known inExpand
Polyynes and Interstellar Carbon Nanoparticles
• Physics
• 2009
Laboratory experiments show that long-chain polyyne molecules are often components of the type of carbon nanoparticle (CNP) that can be associated with the infrared (IR) emission bands attributed toExpand
Infrared Spectrum of Quenched Carbonaceous Composite (QCC). II. A New Identification of the 7.7 and 8.6 Micron Unidentified Infrared Emission Bands
• Physics
• 1987
Infrared spectrum of oxidized quenched carbonaceous composite (QCC) is presented. In addition to the features seen in unoxidized QCC, new features appear at 7.7 and 8.6 microns and the strengths ofExpand
THE ORGANIC REFRACTORY MATERIAL IN THE DIFFUSE INTERSTELLAR MEDIUM : MID-INFRARED SPECTROSCOPIC CONSTRAINTS
This is an analysis of the 4000È1000 cm~1 (2.5È10 km) region of the spectrum of di†use interstellar medium (DISM) dust compared with the spectra of 13 materials produced in the laboratory which serveExpand
Excitation of the Aromatic Infrared Emission Bands: Chemical Energy in Hydrogenated Amorphous Carbon Particles?
• Physics
• 2011
We outline a model for the heating of hydrogenated amorphous carbon (HAC) dust via the release of stored chemical energy and show that this energy ({approx}12 kJ mole{sup -1}) is sufficient to heatExpand
FORMATION OF POLYCYCLIC AROMATIC HYDROCARBONS AND CARBONACEOUS SOLIDS IN GAS-PHASE CONDENSATION EXPERIMENTS
• Physics
• 2009
Carbonaceous grains represent a major component of cosmic dust. In order to understand their formation pathways, they have been prepared in the laboratory by gas-phase condensation reactions such asExpand
Model of molecular structure of the insoluble organic matter isolated from Murchison meteorite
• Chemistry
• 2010
Abstract– The molecular structure of the insoluble organic matter (IOM) from Murchison meteorite has been investigated by our group for several years using a large set of analytical methods includingExpand