Table A.1: Comparison between the integrated photon absorption rates $\mathcal{R}$ (in s-1) and the average absorbed energy $\mathcal{E}$ (in eV) computed using theoretical ( $\sigma _{\rm th}$, Malloci et al. 2004) and laboratory ( $\sigma _{\rm lab}$, Joblin et al. 1992; Joblin 1992) photo-absorption cross-sections for anthracene, pyrene, coronene, and ovalene in the three RFs considered.
  Radiation field
  ISRF Red Rectangle IRAS 21282+5050

 		 $\mathcal{R}$ $\mathcal{E}$ $\mathcal{R}$ $\mathcal{E}$ $\mathcal{R}$ $\mathcal{E}$
  (s-1) (eV) (s-1) (eV) (s-1) (eV)

Anthracene (C14H10)
$\sigma _{\rm lab}$ $6.0\times 10^{-8}$ 7.6 $1.1\times 10^{-6}$ 5.1 $5.9\times 10^{-3}$ 8.9
$\sigma _{\rm th}$ $6.4\times 10^{-8}$ 6.8 $2.5\times 10^{-6}$ 4.0 $5.2\times 10^{-3}$ 8.6

Pyrene (C16H10)
$\sigma _{\rm lab}$ $5.6\times 10^{-8}$ 7.4 $1.1\times 10^{-6}$ 5.2 $5.1\times 10^{-3}$ 8.9
$\sigma _{\rm th}$ $8.1\times 10^{-8}$ 6.4 $3.7\times 10^{-6}$ 3.8 $5.7\times 10^{-3}$ 8.6

Coronene (C24H12)

$\sigma _{\rm lab}$		 $ 1.4\times 10^{-7}$ 6.8 $3.9\times 10^{-6}$ 4.5 $1.1\times 10^{-2}$ 8.6
$\sigma _{\rm th}$ $1.3 \times 10^{-7}$ 6.2 $4.5\times 10^{-6}$ 4.1 $8.5\times 10^{-3}$ 8.5

Ovalene (C32H14)
$\sigma _{\rm lab}$ $2.4\times 10^{-7}$ 5.6 $1.4\times 10^{-5}$ 3.5 $1.3\times 10^{-2}$ 8.2
$\sigma _{\rm th}$ $2.8\times 10^{-7}$ 4.6 $2.0\times 10^{-5}$ 3.1 $1.1\times 10^{-2}$ 8.2


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