Emission spectroscopy is a spectroscopic technique which examines the discrete photon emissions as electromagnetic spectra radiated by some given element. The element first absorbs energy elevating electrons to higher energies and then radiates this energy as characteristic emissions light that are directly related to the decrease in electron energy as it drops in orbitals. This excitation energy can be from a variety of sources, including collision (either due to high temperatures or otherwise), chemical reactions, and light.

Emission spectroscopy