: Astronomie: absorption band

astronomical technique > spectrometry > absorption spectrum > absorption band

absorption band

According to quantum mechanics, atoms and molecules can only hold certain defined quantities of energy, or exist in specific states. When such quanta of electromagnetic radiation are emitted or absorbed by an atom or molecule, energy of the radiation changes the state of the atom or molecule from an initial state to a final state. An absorption band is a range of wavelengths, frequencies or energies in the electromagnetic spectrum which are characteristic of a particular transition from initial to final state in a substance. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Absorption_band)

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