Anharmonicity and the interstellar polycyclic aromatic hydrocarbon infrared emission spectrum

Details Anharmonicity and the interstellar polycyclic aromatic hydrocarbon infrared emission spectrum Anharmonicity and the interstellar polycyclic aromatic hydrocarbon infrared emission spectrum

Publishing date

Apr 1987

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315l..61b&link_type=abstract

Journals

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 315, April 1, 1987, p. L61-L65. DOE-supported resea

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info 2

102

Additional info 3

Aromatic Compounds, Hydrocarbons, Infrared Spectra, Interstellar Gas, Molecular Clouds, Vibrational Spectra

Type

Scientific paper

Abstract

The 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 υ = 1-0 transition. The authors show that structure in the 3 μm 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 μm emission band may also be due to anharmonicity.

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