In the framework of the interstellar PAHs hypothesis, far-IR skeletal bands are expected to be a fingerprint of single species in this class. We developed a detailed model of the photophysics of interstellar PAHs which provides a powerful tool for single-molecule identification. We here present synthetic far-IR emission spectra predicted by the above general approach, based on quantum-chemical calculations, for 20 PAHs and their respective cations, ranging in size from naphthalene (C10H8) to dicoronylene (C 48H20), excited by a range of different radiation fields. Such spectra aim at a direct, quantitative comparison with present (ISO) and forthcoming (Herschel) observations. The accuracy of these spectra is essentially the same as that of the quantum-chemical vibrational analysis, and can be refined using laboratory data, when available.
An atlas of synthetic far-IR emission spectra of specific PAHs for comparison with herschel data
Malloci, G.;
2005-01-01
Abstract
In the framework of the interstellar PAHs hypothesis, far-IR skeletal bands are expected to be a fingerprint of single species in this class. We developed a detailed model of the photophysics of interstellar PAHs which provides a powerful tool for single-molecule identification. We here present synthetic far-IR emission spectra predicted by the above general approach, based on quantum-chemical calculations, for 20 PAHs and their respective cations, ranging in size from naphthalene (C10H8) to dicoronylene (C 48H20), excited by a range of different radiation fields. Such spectra aim at a direct, quantitative comparison with present (ISO) and forthcoming (Herschel) observations. The accuracy of these spectra is essentially the same as that of the quantum-chemical vibrational analysis, and can be refined using laboratory data, when available.
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