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Anharmonicity and the interstellar polycyclic aromatic hydrocarbon infrared emission spectrumThe hypothesis that interstellar infrared emission originates from vibrationally excited polycyclic aromatic hydrocarbons (PAHs) requires that emission can arise from all vibrational levels that are energetically accessible. Due to anharmonicity, the emission from the upper vibrational levels is shifted to longer wavelengths from that of the v = 1-0 transition. It is shown that structure in the 3-micron region is readily and quantitatively explained by emission from upper vibrational levels of excited PAHs that contain a maximum of 20-30 carbon atoms. The asymmetrical broadening of the 11.3-micron emission band may also be due to anharmonicity.
Document ID
19870051121
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Barker, John R.
(Michigan, University Ann Arbor, United States)
Allamandola, L. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Tielens, A. G. G. M.
(California, University Berkeley, United States)
Date Acquired
August 13, 2013
Publication Date
April 1, 1987
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 315
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A38395
Distribution Limits
Public
Copyright
Other

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