Spectroscopy is the study of the interaction between matter and radiated energy. Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, e.g., by a prism. Later the concept was expanded greatly to comprise any interaction with radiative energy as a function of its wavelength or frequency.
Spectroscopic data is often represented by a spectrum, a plot of the response of interest (amplitude) as a function of wavelength or frequency. This is often referred to as spectral power distribution (SPD).
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