While electromagnetic radiation is a continuous spectrum of energies, it is often grouped into categories including gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves. Therefore, emission spectra can also be used to determine the chemical composition of materials.Įlectromagnetic Radiation: Wavelength and EnergyĮlectromagnetic radiation is a form of energy generated by coupled electric and magnetic fields oscillating. As with the absorption spectra, the wavelengths of emission lines are element-specific. The location of the lines indicates the wavelengths of light that are emitted from the sample. This image is an example of an emission spectrum. Therefore, absorption spectra can be used to determine the chemical composition of materials.Įmission spectra are made by measuring the wavelength and intensity of energy emitted from a specimen when heated or given excess energy in some form. The wavelengths of absorption lines are element-specific. The locations of the absorption lines indicate the specific wavelengths at which the substance absorbs incident photons. This image is an example of an absorption spectrum. Absorption spectra are produced by measuring the amount of electromagnetic radiation absorbed by a substance at a range of wavelengths from an incident light source. The incident photon source is a form of electromagnetic radiation such as ultraviolet or visible light. Electronic absorption and emission spectra are graphical representations of the wavelengths of electromagnetic radiation that are absorbed or emitted by a particular substance.
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