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Article: Mixed aromatic-aliphatic organic nanoparticles as carriers of unidentified infrared emission features

TitleMixed aromatic-aliphatic organic nanoparticles as carriers of unidentified infrared emission features
Authors
KeywordsAstronomy
Chemistry
Planetary sciences
Earth science
Issue Date2011
PublisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/nature
Citation
Nature, 2011, v. 479 n. 7371, p. 80-83 How to Cite?
AbstractUnidentified 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 ĝ€̃ cirrus' clouds in the diffuse interstellar medium. Of the more than 160 molecules identified in the circumstellar and interstellar environments, however, not one is a polycyclic aromatic hydrocarbon molecule. The detections of discrete and broad aliphatic spectral features suggest that the carrier of the unidentified infrared emission features cannot be a pure aromatic compound. Here we report an analysis of archival spectroscopic observations and demonstrate that the data are most consistent with the carriers being amorphous organic solids with a mixed aromatic-aliphatic structure. This structure is similar to that of the organic materials found in meteorites, as would be expected if the Solar System had inherited these organic materials from interstellar sources. © 2011 Macmillan Publishers Limited. All rights reserved.
DescriptionLetter
Persistent Identifierhttp://hdl.handle.net/10722/142501
ISSN
2015 Impact Factor: 38.138
2015 SCImago Journal Rankings: 21.936
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administrative Region, ChinaHKU 7027/11P
Funding Information:

We thank A. Tang for technical assistance in the preparation of this manuscript. This work was supported by a grant to S. K. from the Research Grants Council of the Hong Kong Special Administrative Region, China (project no. HKU 7027/11P).

References

 

DC FieldValueLanguage
dc.contributor.authorKwok, Sen_HK
dc.contributor.authorZhang, Yen_HK
dc.date.accessioned2011-10-28T02:49:17Z-
dc.date.available2011-10-28T02:49:17Z-
dc.date.issued2011en_HK
dc.identifier.citationNature, 2011, v. 479 n. 7371, p. 80-83en_HK
dc.identifier.issn0028-0836en_HK
dc.identifier.urihttp://hdl.handle.net/10722/142501-
dc.descriptionLetteren_US
dc.description.abstractUnidentified 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 ĝ€̃ cirrus' clouds in the diffuse interstellar medium. Of the more than 160 molecules identified in the circumstellar and interstellar environments, however, not one is a polycyclic aromatic hydrocarbon molecule. The detections of discrete and broad aliphatic spectral features suggest that the carrier of the unidentified infrared emission features cannot be a pure aromatic compound. Here we report an analysis of archival spectroscopic observations and demonstrate that the data are most consistent with the carriers being amorphous organic solids with a mixed aromatic-aliphatic structure. This structure is similar to that of the organic materials found in meteorites, as would be expected if the Solar System had inherited these organic materials from interstellar sources. © 2011 Macmillan Publishers Limited. All rights reserved.en_HK
dc.languageengen_US
dc.publisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/natureen_HK
dc.relation.ispartofNatureen_HK
dc.subjectAstronomy-
dc.subjectChemistry-
dc.subjectPlanetary sciences-
dc.subjectEarth science-
dc.titleMixed aromatic-aliphatic organic nanoparticles as carriers of unidentified infrared emission featuresen_HK
dc.typeArticleen_HK
dc.identifier.emailKwok, S: deannote@hku.hken_HK
dc.identifier.emailZhang, Y: zhangy96@hku.hken_HK
dc.identifier.authorityKwok, S=rp00716en_HK
dc.identifier.authorityZhang, Y=rp00841en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1038/nature10542en_HK
dc.identifier.scopuseid_2-s2.0-80455130958en_HK
dc.identifier.hkuros197090en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80455130958&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume479en_HK
dc.identifier.issue7371en_HK
dc.identifier.spage80en_HK
dc.identifier.epage83en_HK
dc.identifier.eissn1476-4687-
dc.identifier.isiWOS:000296422600035-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridKwok, S=22980498300en_HK
dc.identifier.scopusauthoridZhang, Y=23768446500en_HK
dc.identifier.citeulike9953538-

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