Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488l..39e&link_type=abstract
Astrophysical Journal Letters v.488, p.L39
Astronomy and Astrophysics
Astronomy
16
Ism: Molecules, Molecular Processes
Scientific paper
Fourier transform ion cyclotron resonance mass spectra of coronene and naphtho[ 2,3 -a]pyrene radical cations exposed to broadband ultraviolet/visible radiation are presented. Parent ions are formed and confined in a Penning trap at 3.0 T and photolyzed with an Xe arc lamp. Each of the two radical cations is found to de-hydrogenate completely to leave the C ^{+}24 bare carbon cluster cation. The extent of dehydrogenation depends directly on irradiation power. We infer that polycyclic aromatic hydrocarbon cations are inherently unstable to photolysis. We discuss some implications of hydrogen loss to yield bare carbon cluster cations. The relevance of dehydrogenation to unidentified interstellar infrared emission bands is discussed briefly.
Ekern Scott P.
Marshall Alan G.
Szczepanski Jan
Vala Martin
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