CONTROLLING NONSPREADING WAVEPACKETS

We show how a static electric field can be used to control the localiz ation of nonspreading wavepackets of a hydrogen atom driven by a linea rly polarized microwave field. This allows for creation of wavepackets localized on fully stable resonance islands which, at the same time, can easily be excited by a direct optical transition from a low lying state. A semiclassical analysis is used to predict the energies and pr operties of such states.