Abstract
Stark shifts of high np and ns Rydberg states in 85Rb with n ranging from 46 to 149 were investigated experimentally as well as theoretically. From the measured Stark shifts up to the electric fields at the first avoided-crossing points with their adjacent manifolds, it is shown that the fourth-order terms contribute significantly to the overall Stark shifts for the np states in addition to those of the second-order. Theoretical predictions of the shifts based on a method of Hamiltonian-diagonalization calculations reproduce well the higher order effect and also their principal-quantum-number dependence.
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