Far-Infrared Emission Spectra of Selected Gas-Phase PAHs: Spectroscopic Fingerprints

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Science  25 Oct 1996:
Vol. 274, Issue 5287, pp. 582-583
DOI: 10.1126/science.274.5287.582


The emission spectra of the gaseous polycyclic aromatic hydrocarbons (PAHs) naphthalene, chrysene, and pyrene were recorded in the far-infrared (far-IR) region. The vibrational bands that lie in the far IR are unique for each PAH molecule and allow discrimination among the three PAH molecules. The far-IR PAH spectra, therefore, may prove useful in the assignment of unidentified spectral features from astronomical objects.