The Reionization Method

This non-optical detection method is based on optical pumping between two fine-structure states of atomic levels. If the two atomic levels have significantly different ionization energies, this can be used to detect the laser induced change of levels. After the interaction with the spectroscopic laser light the atoms experience a collision with molecules of a gaseous target. Depending on the atomic state of the atoms, the cross section for ionization by the collision is different. Ions produced in this way can be easily deflected and counted. The atoms which didn’t get ionized will pass straight through and will also get counted in an atom-counter. A normalized of the two count rates gives information where the optical resonance was places

  1. The optical pumping scheme
  2. The experimental setup
  3. Detection techniques

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