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Important spectral lines per band

By no means complete…

Optical

H-beta: 4861 Å

[O III]: 4959 Å, 5007 Å (ionisation potential: 54.9 eV)

[O I]: 6300 Å

[N II]: 6548 Å

H-alpha: 6563 Å

[N II]: 6583 Å

[S II]: 6716 Å, 6731 Å

JHK bands (“near-infrared”)

Pa-beta: 1.282 µm

[Fe II]: 1.5995 µm, 1.644 µm

Pa-alpha: 1.875 µm

[Si VI]: 1.96 µm (IP: 167 eV, “coronal line”)

[Al IX]: 2.04 µm (IP: 285 eV, “coronal line”)

H_2 1-0 S(1): 2.122 µm

Br-gamma: 2.166 µm

[Ca VIII]: 2.321 (IP: 127 eV, “coronal line”)

CO bandheads: 2.29 µm (K1), 2.32 µm (K2), 2.35 mm, 2.38 µm, 2.41 µm

LM bands (near- or mid-infrared, thermal infrared)

H_2O (ice) 3.14 µm

H_2O (gas) 2.8 – 4.0 µm

Br-alpha: 4.05 µm

Pf-beta: 4.65 µm

PAHs: 3.3, 3.4 µm

Nanodiamonds: 3.52 µm

CO fundamental transitions (gas): 4.6 – 4.78 µm

CO (ice): 4.6 – 4.7 µm

N band (mid-infrared, thermal infrared)

Amorphous silicates: 9.8 µm

Crystalline silicates (olivines, pyroxenes): 9.7 µm, 10.6 µm, 11.3 µm, 11.6 µm

PAHs: 8.6 µm, 11.4 µm, 12.2 µm, 12.8 µm

[S IV]: 10.5 µm

[Ne II]: 12.8 µm

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