Unlike visible light which shows a continuous spectrum of all wavelengths, the emission spectra of atoms in the gas phase emit light only at specific wavelengths with dark spaces between them. Spectroscopy is the study of emission and absorption spectra. It is the spectrum formed by electromagnetic radiation that has passed through a medium, in which radiation of some frequencies is absorbed. Atoms, molecules, and ions that have absorbed radiation are called ‘ excited‘. The absorption spectrum is the opposite of the emission spectrum. The emission spectrum is the spectrum of radiation emitted by a substance that has absorbed energy.
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