RABBITT phase transition across the ionization threshold

Abstract

The authors present a theoretical treatment of attosecond phase shifts in photoionization due to the interference of pathways involving two-photon transitions with adjacent harmonics for the special case where one of the involved states is a bound state, rather than the usual situation where both states are in the continuum. They show that this process provides an alternative way of assessing the continuum-continuum phase, which is usually closely linked to the Wigner time delay and hard to access experimentally.

Topics & Concepts