Statistics – Computation
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429l..91d&link_type=abstract
The Astrophysical Journal, vol. 429, no. 2, pt. 2, p. L91-L93
Statistics
Computation
2
Allocations, Cyclic Hydrocarbons, Emission, Infrared Spectra, Interstellar Gas, Nebulae, Vibrational Spectra, Computation, Forbidden Transitions, Predictions
Scientific paper
The origin of 3.40 micrometers, 3.51 micrometers, and other emission lines that accompany the 3.28 micrometers feature observed in many nebulae is discussed. The assignment of 3.40 and 3.51 micrometers emission to 2 to 1 and 3 to 2 transitions, respectively, of the fundamental CH stretch in relatively small polycyclic aromatic hydrocarbon (PAH) molecules is shown to be plausible even in the absence of 2 to 0 1.67 micrometers overtone emission if the emitters (1) have a center of symmetry and (2) are in the gas phase. An analysis of electric-dipole-allowed transitions in such molecules shows that, while the 1.67 micrometers 2 to 0 overtone is forbidden, overtones of other fundamentals should occur in this spectral region, but not generally at 1.67 micrometers. The 3 to 0 overtone of the fundamental CH stretch is allowed and would occur at lambda = 1.1325 micrometers (8830 cm-1. An emission feature at this wavelength may be present in spectra of NGC 7027 and BD +30 deg. 3639.
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