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Table 1

Band parameters of astronomical PAHs.

Center wavelength Damping constant Integrated cross sectiona Modeb
λ0 (μm) γ (1012 s-1) σint (10-22 cm2   μm)
ISM + NGC 2023 Starburstsc ISMd NGC 2023d Starburstsc ISMd NGC 2023d
Starbursts
0.2175 ···  1800 1800 ···  8000 8000 π∗ ← π transitions
3.3 ···  20 20 20 10 20 20 C-H stretch
5.1 ···  12 20 20 1 2.7 2.7 C-C vibration
6.2 ···  14 14 14 21 10 30 C-C vibration
7.0 ···  6 6 5 13 5 10 C-H?
7.7 ···  22 22 20 55 35 55 C-C vibration
8.6 ···  6 6 10 35 20 35 C-H in-plane bend
11.3 ···  4 6 4 36 250 52 C-H solo out-of-plane bend
11.9 ···  7 7 7 12 60 12 C-H duo out-of-plane bend
12.7 ···  3.5 5 3.5 28 150 28 C-H trio out-of-plane bend
13.6 ···  4 4 4 3.7 3.7 3.7 C-H quarto out-of-plane
14.3 ···  5 5 5 0.9 0.9 0.9 C-C skeleton vibration
15.1 15.4 3 4 4 0.3 0.3 0.3 C-C skeleton vibration
15.7 15.8 2 5 4 0.3 0.3 5 C-C skeleton vibration
16.5 16.4 3 10 1 0.5 5 6 C-C skeleton vibration
18.2 17.4 3 10 0.2 1 3 1 C-C skeleton vibration
21.1 18.9 3 10 0.2 2 2 2 C-C skeleton vibration
23.1 ···  3 10 4 2 2 1 C-C skeleton vibration

Notes.

(a)

Cross sections are integrated over the band and are given per H atom for C-H vibrations, and per C atom for C-C modes;

(b)

assignment following Tielens (2008), Moutou et al. (1996), Pauzat et al. (1997);

(c)

Siebenmorgen et al. (2001);

(d)

this work (Sects. 4.1, 5).

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