Abstract

In strong field double ionization we typically distinguish between sequential double ionization (SDI), where the electrons are assumed to interact independently with the laser field, and non-sequential double ionization (NSDI), where the electrons cannot be treated separately [1]. During the last few years the research focus has been on double ionization by linearly polarized laser pulses with the result that over a wide intensity range the dominating NSDI mechanism is electron impact ionization or excitation at recollision of the first ionized electron with the parent ion, whereas at higher intensities SDI becomes dominant.

© 2011 Optical Society of America