M. Kalinski et Jh. Eberly, NONSPREADING RYDBERG WAVE-PACKETS SUPPORTED BY A LINEARLY POLARIZED ELECTROMAGNETIC-FIELD, Physical review. A, 52(5), 1995, pp. 4285-4288
We predict and confirm numerically the existence of shape-invariant Ry
dberg wave packets in the hydrogen atom in a strong linearly polarized
electromagnetic field. They correspond to similar wave packets recent
ly discussed for the same quantum system, but when the electromagnetic
field was circularly polarized. The : trajectory of the packets is el
liptical within the present approximation and the parameters of the el
lipse are found For every electric-field strength there is a twin pair
of states.