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3.3 micron emission from ultraviolet excitation of some aromatic moleculesInfrared emissions are observed from photoexcitation of benzene, naphthalene, phenanthrene, anthracene, pyrene, and their methyl derivatives in the gas phase at 193 nm using an ArF laser as a light source. An emission band with peak at 3.3 microns is observed from all the molecules studied. This band is attributed to the aromatic C-H stretching vibrational modes. In addition to the 3.3-microns band, an emission band at 3.4-3.6 microns is observed from photoexcitation of the methyl derivatives, which is attributed to the C-H stretching vibrational modes of the CH3 group. The observed spectra are compared with the IR emission bands observed in many astronomical objects. The current laboratory data lend support to a model in which PAH molecules are responsible for the 'unidentified' interstellar IR emissions. IR emissions from the 193-nm excitation of several interstellar molecules other than PAHs are also observed, but they are quite different from the interstellar IR bands.
Document ID
19920033897
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Shan, Jun
(San Diego State Univ. San Diego, CA, United States)
Suton, Masako
(San Diego State Univ. San Diego, CA, United States)
Lee, L. C.
(San Diego State University CA, United States)
Date Acquired
August 15, 2013
Publication Date
December 10, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 383
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A16521
Funding Number(s)
CONTRACT_GRANT: NAGW-319
Distribution Limits
Public
Copyright
Other

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