Abstract

The multiphoton ionization of atoms and molecules has been extensively studied, both experimentally and theoretically, ever since its discovery. The recently discovered phenomena such as ATI and transient resonance have enriched the understanding of laser-matter interaction on the atomic scale[1]. However, most of the studies on the MPI were done with low pressure gases, where inter-atomic distance is larger than the electron excursion amplitude, and hence the collision effect is negligible.

© 1996 Optical Society of America