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Absorption and Laser Induced Fluorescence Spectroscopy of Neutral Polycyclic Aromatic Hydrocarbons in Argon matrices

Published online by Cambridge University Press:  18 July 2017

Salma Bejaoui ,
Farid Salama  and
Ella Sciamma-O'Brien
Salma Bejaoui
Affiliation:
NASA Ames Research Center, Mail Stop 245-6, Moffett Field, California 94035-1000 NPP, Oak Ridge Associated Universities
Farid Salama
Affiliation:
NASA Ames Research Center, Mail Stop 245-6, Moffett Field, California 94035-1000
Ella Sciamma-O'Brien
Affiliation:
NASA Ames Research Center, Mail Stop 245-6, Moffett Field, California 94035-1000 BAER Institute, Petaluma, CA email: salma.bejaoui@nasa.gov
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Polycyclic aromatic hydrocarbons (PAHs) are considered as plausible carriers for the extended red emission (ERE), a photoluminescent process associated with a wide variety of interstellar environments, as well as for broad emission band features seen in cometary spectra. We report the absorption spectra of phenanthrene, anthracene, fluoranthene, pentacene, pyrene, chrysene and triphenylene isolated at 10 K in solid argon matrices together with laser induced fluorescence (LIF) spectra at 355 nm of matrix-isolated anthracene and fluoranthene. LIF spectra are compared with the UV/blue fluorescence spectra of the Red Rectangle Nebula (RR). The LIF spectra measured in solid Ar matrices have been shifted to the predicted position of the PAH band emission in the gas phase for comparison with the astronomical observations (Fig. 1).

Keywords

PAHfluorescenceUV-VISEREcomet
Type
Addendum
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , E17
Copyright
Copyright © International Astronomical Union 2017 

References

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