Fig. 3.
Temperature T for coronene with vibrational energy E, calculated from its vibrational mode spectrum (see Draine & Li 2001). For coronene to attain a vibrational temperature of T ≳ 2200, 3000, and 4000 K, its vibrational energy E has to exceed ∼13.2, 20.0, and 28.5 eV, respectively. This can only be achieved for PAHs excited by multiple photons or energetic particles.
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