Swan band

Swan bands are a characteristic of the spectra of carbon stars, comets and of burning hydrocarbon fuels.

[1][2] They are named for the Scottish physicist William Swan, who first studied the spectral analysis of radical diatomic carbon (C2) in 1856.

[3] Swan bands consist of several sequences of vibrational bands scattered throughout the visible spectrum.

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Spectrum of the blue flame from a butane torch showing excited molecular radical band emission and Swan bands.