When an atom or molecule absorbs energy, then the electrons are excited to a higher energy level and when the electron falls back to its lower energy level, light is emitted or produced, which generally has the energy equivalent, to the difference between higher and the lower states energy.ĭue to the availability of numerous states of energy, an electron thus can undergo many transitions, each transition gives rise to a unique wavelength that encompasses the emission spectrum. The emission spectrum is commonly formed by the radiation emitted or produced by an electron in the excited molecules or atoms and this is termed as the emission spectrum.
