The semiclassical helium atom.

  title={The semiclassical helium atom.},
  author={Dieter Wintgen and Klaus Richter and Gregor Tanner},
  volume={2 1},
Recent progress in the semiclassical description of two-electron atoms is reported herein. It is shown that the classical dynamics for the helium atom is of mixed phase space structure, i.e., regular and chaotic motion coexists. Semiclassically, both types of motion require separate treatment. Stability islands are quantized via a torus-quantization-type procedure, whereas a periodic-orbit cycle expansion approach accounts for the states associated with hyperbolic electron pair motion. The… CONTINUE READING

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