Swan bands are a characteristic of the spectra of carbon stars, comets and of burning hydrocarbon fuels. They are named for the Scottish physicist William Swan who first studied the spectral analysis of radical carbon C2 in 1856.
Swan bands consist of several sequences of vibrational bands scattered throughout the visible spectrum.
- R.C. Johnson (1927). "The structure and origin of the Swan band spectrum of carbon". Philosophical Transactions of the Royal Society A 226 (636–646): 157–230. Bibcode:1927RSPTA.226..157J. doi:10.1098/rsta.1927.0005.
- W.E. Pretty (1927). "The Swan band spectrum of carbon". Proceedings of the Physical Society 40: 71–78. Bibcode:1927PPS....40...71P. doi:10.1088/0959-5309/40/1/313.
- W. Swan (1857). "On the prismatic spectra of the flames of compounds of carbon and hydrogen". Transactions of the Royal Society of Edinburgh 21: 411–430.
- Robert B. King (1948). "Relative Transition Probabilities of the Swan Bands of Carbon". Astrophysical Journal 108: 429. Bibcode:1948ApJ...108..429K. doi:10.1086/145078.
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