Near-resonant atomic transitions

  1. To excite an electron in the atom from lower state to higher you need an EM field of frequency that matches the energy difference between those levels. How does the near-resonance transition work then?
    Thanks in advance.
     
  2. jcsd
  3. mfb

    Staff: Mentor

    You need an EM field which matches the energy difference within the natural width of that transition (or within Doppler broadening, or whatever else smears out the energy levels).
     
  4. If you use the drude model for an oscillator and include a damping term (modelled as a fictional force on the dynamical equation), you can allow for broadening and the peak of the resonant absorption frequency is not a sharp peak but rather a broad peak that is be centered around some maximum value. It is this broadening causes near-resonance transition.
     
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