Astrophysics (index)

Spectral Band

(set of related, closely-packed spectral lines)

The term Spectral Band can be used in a general way to indicate a contiguous set (interval) of spectral Wavelengths.

It also has a more specific meaning: such an interval of wavelengths that are affected by a molecule, often a large, complex molecule, that produces many Spectral Lines, often forming a closely-packed pattern, even to the point of overlapping. If they overlap or if the Spectroscope's Spectral Resolution (R) is low, it is seen as a range of Absorption (Absorption Band) or Emission (Emission Band).

Polycyclic Aromatic Hydrocarbons (PAH) produce these, e.g., PAH Emissions. Water Lines are another example.


(spectrography)
http://en.wikipedia.org/wiki/Spectral_bands

Referenced by:
Gunn-Peterson Trough
Imaging Fourier Transform Spectroscopy (IFTS)

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