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"absorption spectrum" is a perfectly acceptable phrase in written English.
You can use it to refer to an electromagnetic spectrum which is used to measure the absorption of energy by matter as a function of frequency or wavelength. For example, "The absorption spectrum of the molecule was studied to determine its structure."
Dictionary
absorption spectrum
noun
The characteristic pattern of dark lines or bands that occurs when electromagnetic radiation is passed through an absorbing medium into a spectroscope.
Exact(60)
(b) Spectral fitting to the absorption spectrum.
b, Absorption spectrum of 40 nm FLV-MoS2.
The transparency window was observed in the broader absorption spectrum of the dipole antenna via coherent coupling with a sharper absorption spectrum of the quadrupole antenna.
It differed from vitamin B12 in its absorption spectrum and its electrophoretic and chromatographic properties.
These organs contain a visual pigment with an absorption spectrum characteristic of rhodopsin.
The absorption spectrum of the construct demonstrated all of the features of EtNBS.
The absorption spectrum changes could be well correlated with the pulse.
It has an absorption spectrum that's almost ideal for the sun.
Each voxel now contains an absorption spectrum as opposed to a grayscale value.
Table 2: Maximal absorption spectrum ( λ max) of long wavelength-sensitive opsins (LWS).
They found that light with a wavelength of 1.4 micrometres was absorbed, matching the absorption spectrum of water molecules.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com