The discovery of a new infrared emission feature at 1905 wavenumbers (5. 25 microns) in the spectrum of BD + 30 deg 3639 and its relation to the polycyclic aromatic hydrocarbon model

Journal Article · Sun Oct 01 00:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/185552· OSTI ID:5095690

Allamandola, L J; Bregman, J D; Sandford, S A; Tielens, A G.G.M.; Witteborn, F C ^[1]

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1. NASA, Ames Research Center, Moffett Field, CA (USA)

A new IR emission feature at 1905/cm (5.25 microns) has been discovered in the spectrum of BD + 30 deg 3639. This feature joins the family of well-known IR emission features at 3040, 2940, 1750, 1610, 1310, 1160, and 890/cm. The origin of this new feature is discussed and it is assigned to an overtone or combination band involving C-H bending modes of polycyclic aromatic hydrocarbons (PAHs). Laboratory work suggests that spectral studies of the 2000-1650/cm region may be very useful in elucidating the molecular structure of interstellar PAHs. The new feature, in conjunction with other recently discovered spectral structures, suggests that the narrow IR emission features originate in PAH molecules rather than large carbon grains. 35 refs.

• OSTI ID: 5095690
• Journal Information: Astrophysical Journal; (USA), Vol. 345; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
INTERSTELLAR SPACE
CHEMICAL COMPOSITION
POLYCYCLIC AROMATIC HYDROCARBONS
INFRARED SPECTRA
COSMIC GASES
EMISSION SPECTRA
INFRARED RADIATION
MOLECULES
SPECTROSCOPY
AROMATICS
ELECTROMAGNETIC RADIATION
FLUIDS
GASES
HYDROCARBONS
ORGANIC COMPOUNDS
RADIATIONS
SPACE
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies