Reversed Dark Resonance in Rb Atom Excited by a Diode Laser
  Origin of recently discovered reversed (opposite sign) dark resonances was explained theoretically and verified experimentally. It is shown that the reason for these resonances is a specific optical pumping of ground state level in a transition when ground state angular momentum is smaller than the excited state momentum. 
Janis Alnis, Marcis Auzinsh (Dept. of Physics, Univeristy of Latvia)