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transition frequency

The frequency associated with the difference between two discrete energy levels in an atomic system, given by where f _{2,1} is the frequency associated with the difference between two energy levels, E_{2} and E_{1 }(E_{2 }> E_{1}), and is Planck's constant. Note: If a transition from E_{2} to E_{1} occurs, a photon with frequency f _{2,1} is likely to be emitted. If the atomic system is at energy level E_{1}, and a photon of frequency f _{2,1} is absorbed, the energy level will be raised to E_{2}. [From Weik '89]


