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Resonant energy transfer between cold Rydberg atoms was used to determineRydberg atom energy levels, at precisions approaching those obtainable inmicrowave spectroscopy. Laser cooled Rb atoms from a magneto-optical trap wereoptically excited to 32d Rydberg states. The two-atom process 32d(j=5/2) +32d(j=5/2) -> 34p(j=3/2) + 30g is resonant at an electric field ofapproximately 0.3 V/cm. This process is driven by the electric dipole-dipoleinteraction, which is allowed due to the partial f character that the g stateacquires in an electric field. The experimentally observed resonant field,together with the Stark map calculation is used to make a determination of theRb ng-series quantum defect: delta_g (n=30) = 0.00405(6)

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Determination of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>85</mml:mn></mml:mmultiscripts></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>n</mml:mi><mml:mi>g</mml:mi></mml:mrow></mml:math>-series quantum defect by electric-field-induced resonant energy transfer between cold Rydberg atoms

Determination of theRb85ng-series quantum defect by electric-field-induced resonant energy transfer between cold Rydberg atoms