Holographic structures in photoelectron spectra

S. D. LÓPEZ; ARBÓ, D G

Budapest

Conferencia; The International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces; 2018

EKHO' 94 Ltd., Debrecen

When an intense short laser pulse interacts with an atom ionizing it, the photoelectron spectra present several structures that can be understoodas double slit interferences in the time domain, namely intra- and inter-cycle interferences [1]. This type of structures are formed by electrons that emerge from the atom and follows directly to detector. There is another type of structures that requires interference of former direct electrons with other that interact with the parent core. In a classical picture, the latter returnsto the parent ion driven by the laser eld and rescatters off to the detector. It is well known that a short range potential is sufficient to understand the rescattering rings at high energy, formed by very hard interaction among electron and ion [2]. Other structures can be explained only when long range coulombic interactions take place. This type of structures can be interpretedas holograms, i.e. the interference pattern between the direct (reference) and the rescattered (signal beam) electrons. In this way, the information of the interaction is encoded in the interference pattern between the reference and thesignal [3].In this work we present a theoretical analysis of interferences using a numerical solution of the time dependent Schrödinger equation (TDSE)and semiclassical approaches, namely, quantum trajectory monte carlo (QTMC) and the semiclassical two step model (SCTS) [4]. We analyze the ionization of atomic hydrogen to characterize the role that the long range Coulomb interactionplays in the holographic stuctures. Particularly, we focus our analysis for very few cycle laser pulses allowing ionization in some parts, to turn on and off different kind of interferences. With semiclassical approaches we can examinate the trajectories that lead to different nal conditions and get a deeper understanding of the electron kinematics associated to holographic structures.