Excitation and Deexcitation of Interstellar Polycyclic Aromatic Hydrocarbon / PAH / Emitters

Details Excitation and Deexcitation of Interstellar Polycyclic Aromatic Hydrocarbon / PAH / Emitters Excitation and Deexcitation of Interstellar Polycyclic Aromatic Hydrocarbon / PAH / Emitters

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246p..18d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 246, NO.2/SEP15, P. 18P, 1990

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The population of vibrational levels in PAH emitters is examined using a simple optical pumping model. It is shown that significant pumping effects occur for vibrational states with energies ≤ 200 cm-1. The long radiative lifetime of these states implies that they may exhibit enhanced or inverted population relative to lower levels. The apparent absence of strong discrete PAH emission at λ > 15 μm suggests the existence of a hitherto unrecognized quenching mechanism and may provide useful insight into the physical state of these emitters.

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