PEAK ASYMMETRY OF AC STARK SPLITTING IN RESONANT EXCITATION OF MULTILEVEL SYSTEMS DUE TO THE EXISTENCE OF NEAR-DEGENERATE STATES

  • Calculation on resonant excitation of a four-level system with a pair of near-degenerate intermediate states is presented. It is shown that due to the presence of these near-degenerate states, reversed peak asymmetry and asymmetric absorption(ionization) profile is obtained.
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