Comment on "Recurrences without closed orbits"

Details Comment on "Recurrences without closed orbits" Comment on "Recurrences without closed orbits"

1999-08-02

arxiv.org/abs/physics/9908001v1

Phys. Rev. A 60 (1999) 1726

Physics

Atomic Physics

2 pages, 1 figure, REVTEX

Scientific paper

10.1103/PhysRevA.60.1726

In a recent paper Robicheaux and Shaw [Phys. Rev. A 58, 1043 (1998)] calculate the recurrence spectra of atoms in electric fields with non-vanishing angular momentum not equal to 0. Features are observed at scaled actions ``an order of magnitude shorter than for any classical closed orbit of this system.'' We investigate the transition from zero to nonzero angular momentum and demonstrate the existence of short closed orbits with L_z not equal to 0. The real and complex ``ghost'' orbits are created in bifurcations of the ``uphill'' and ``downhill'' orbit along the electric field axis, and can serve to interpret the observed features in the quantum recurrence spectra.

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