Hydrogenated Polycyclic Aromatic Hydrocarbons and the 2940 and 2850 Wavenumber (3.40 and 3.51 micron) Infrared Emission Features

Details Hydrogenated Polycyclic Aromatic Hydrocarbons and the 2940 and 2850 Wavenumber (3.40 and 3.51 micron) Infrared Emission Features Hydrogenated Polycyclic Aromatic Hydrocarbons and the 2940 and 2850 Wavenumber (3.40 and 3.51 micron) Infrared Emission Features

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...472l.127b&link_type=abstract

Astrophysical Journal Letters v.472, p.L127

Astronomy and Astrophysics

Astronomy

61

Infrared: Ism: Lines And Bands, Ism: Molecules, Ism: H Ii Regions, Ism: Planetary Nebulae: General, Molecular Processes

Scientific paper

The 3150--2700 cm-1 (3.17--3.70 mu m) range of the spectra of a number of Ar-matrix--isolated PAHs containing excess H atoms (Hn-PAHs) are presented. This region covers features produced by aromatic and aliphatic C--H stretching vibrations as well as overtone and combination bands involving lower lying fundamentals. The aliphatic C--H stretches in molecules of this type having low to modest excess H coverage provide excellent fits to a number of the weak emission features superposed on the plateau between 3080 and 2700 cm-1 (3.25 and 3.7 mu m) in the spectra of many planetary nebulae, reflection nebulae, and H II regions. Higher H coverage is implied for a few objects. We compare these results in context with the other suggested identifications of the emission features in the 2950--2700 cm-1 (3.39--3.70 mu m) region and briefly discuss their astrophysical implications.

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