Table 1
Spectral properties (attribution, position, width, integrated cross section, and oscillator strength) of the PAH bands considered for comparison with astrophysical data in this article.
| Molecule | Electronic transition | λ air a | FWHM | ∫σdλ | f | N max b |
| (Å) | (Å) | (10-16 cm2 Å) | (cm-2) | |||
|
|
||||||
| anthracene | S1 ← S0 | 3610.74c | 0.34 | 19 | 0.016 | 5.3 × 1011 |
| phenanthrene | S1 ← S0 | 3409.21d | 0.20 | 0.16 | 0.00016 | 6.2 × 1013 |
| pyrene | S2 ← S0 | 3208.22e | 5.5 | 89 | 0.097 | 1.1 × 1011 |
| 3166.26e | 4.7 | 30 | 0.033 | 3.4 × 1011 | ||
| 2,3-benzofluorene | S1 ← S0 | 3344.16f | 0.18 | 8.4 | 0.0085 | 1.2 × 1012 |
| 3266.63f | 0.22 | 2.4 | 0.0025 | 4.2 × 1012 | ||
| benzo[ghi]perylene | S2 ← S0 | 3512.15g | 8.2 | 9.9 | 0.009 | 1 × 1012 |
| 3501.76g | 5.3 | 5.7 | 0.005 | 1.8 × 1012 | ||
| hexabenzocoronene | β-band | 3344 ± 8h | 900i | |||
Notes.
an upper limit of the column density has been calculated assuming a detection limit with an equivalent width of 1 mÅ;
extrapolated from Ne and Ar matrix measurements (Rouillé et al. 2009b);
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