Spectroscopy is the analysis of the interaction
between matter and any portion of the spectrum. Historically, spectrum analysis concerned the spectrum of sunshine, but x-ray,
gamma, and actinic ray spectrum analysis are valuable analytical
techniques. Spectroscopy analysis might involve any interaction
between lightweight and
matter, as well as absorption,
emission, scattering, etc.
Data obtained from spectrum analysis is sometimes bestowed as a spectrum (plural: spectra) that's a plot of the issue being measured as an operating of either frequency or wavelength. Emission spectra and absorption spectra are common examples.