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Infrared fluorescence from PAHs in the laboratorySeveral celestial objects, including UV rich regions of planetary and reflection nebulae, stars, H II regions, and extragalactic sources, are characterized by the unidentified infrared emission bands (UIR bands). A few years ago, it was proposed that polycyclic aromatic hydrocarbon species (PAHs) are responsible for most of the UIR bands. This hypothesis is based on a spectrum analysis of the observed features. Comparisons of observed IR spectra with lab absorption spectra of PAHs support the PAH hypothesis. An example spectrum is represented, where the Orion Bar 3.3 micron spectrum is compared with the absorption frequencies of the PAHs Chrysene, Pyrene, and Coronene. The laser excited 3.3 micron emission spectrum is presented from a gas phase PAH (azulen). The infrared fluorescence theory (IRF) is briefly explained, followed by a description of the experimental apparatus, a report of the results, and discussion.
Document ID
19910005621
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cherchneff, Isabelle (Michigan Univ. Ann Arbor, MI, United States)
Barker, John R. (Michigan Univ. Ann Arbor, MI, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1989
Publication Information
Publication: NASA, Ames Research Center, Interstellar Dust: Contributed Papers
Subject Category
Space Radiation
Accession Number
91N14934
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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