CLASSICAL SUPPORT FOR NONDISPERSIVE 2 ELECTRON-WAVE PACKETS IN THE DRIVEN HELIUM ATOM

We present numerical evidence for the existence of a classically non-i onizing, highly correlated two-electron configuration which emerges fr om the frozen planet configuration of helium exposed to an electromagn etic field of linear polarization. A static electric field parallel to the polarization axis prevents this configuration from transverse ion ization. We argue that the corresponding nonlinear resonance island in 12D phase space supports nondispersive wave packets of the helium ato m in combined oscillating and static electric fields.