title: Recollision scenario without tunneling: role of the ionic core potential.
abstract: We present a purely classical recollision scenario, i.e., without tunneling, which, in contrast to the standard three-step model, takes into account the ionic core potential fully at all stages of the recollision process and is valid at all intensities. We find that a key periodic orbit drives the recollisions by guiding electrons away and back to the core. At sufficiently high intensity, we connect our scenario to the three-step model, and explain why the three-step model leads to good agreement with the cutoff in high harmonic generation despite neglecting the core potential after tunneling.
authors.affiliation: School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA and Centre de Physique Théorique, CNRS, Aix-Marseille Université, Campus de Luminy, Case 907, 13009 Marseille, France.
authors.forename: A
authors.initials: A
authors.lastname: Kamor
authors.affiliation: Centre de Physique Théorique, CNRS, Aix-Marseille Université, Campus de Luminy, Case 907, 13009 Marseille, France.
authors.forename: C
authors.initials: C
authors.lastname: Chandre
authors.affiliation: School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.
authors.forename: T
authors.initials: T
authors.lastname: Uzer
authors.affiliation: Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada.
authors.forename: F
authors.initials: F
authors.lastname: Mauger