Abstract
The diamagnetic Rydberg atom, a quantum-mechanical system with chaotic dynamics in the semiclassical limit, is a prototype system to investigate ‘‘quantum chaos’’ @1,2#. Classically, irregular motion arises when the spherical Coulomb term in the Hamiltonian becomes of the same order of magnitude as the cylindrical diamagnetic term, a situation which can easily be created in an experiment with Rydberg atoms. The scaling properties of Rydberg atoms can be used to perform experiments under fixed classical conditions. In such experiments the field strength g (g5B/2.35310 5 T) is adapted to the laser frequency exciting the Rydberg atom ~excitation to energy E) in order to keep the scaled energy «5Eg 22/3 constant @3#. In the field-free case («52‘),
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