Strong Fields

Dynamic Polarization

A multi-active-electron molecular system need not be long to exhibit another mechanism of tunnel ionization suppression. Exposed to strong laser field electrons are pushed collectively towards the tunneling barrier, creating polarization that increases the tunneling barrier and reduces ionization rate. This effect was observed already in transition metals atoms. An ideal ground for investigating this dynamic multielectron polarization effect is metal clusters. They still have a relatively short length (may be viewed as a conducting sphere) so that nonadiabatic multielectron dynamics can be ignored, but at the same time they possess many equivalent highly polarizable electrons[1].

1: PRL: 93, 203402 (2004)