Absorption band

An absorption band is a range of wavelengths (or, equivalently, frequencies) in the electromagnetic spectrum which are able to excite a particular transition in a substance. See absorption spectrum. Since energetic transitions can take place in both directions, many absorption bands can also act as an emission band.
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Noun
1. a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths
(hypernym) optical phenomenon

A spectral region in which the absorption coefficient reaches a relative maximum, by virtue of the physical properties of the matter in which the absorption process takes place. [FAA ]

BANDA D'ASSORBIMENTO [CINEMA]

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