Proov neelab kiirgavalt väljalt energiat, st footoneid, ning seejuures neeldumise intensiivsus teisendub sageduse funktsiooniks ja see teisendus on neeldumisspektroskoopia neeldumisspekter.
The sample absorbs energy, i.e., photons, from the radiating field; the intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum of absorption spectroscopy.
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