Estructuras holográficas en espectros fotoelectróncias

LÓPEZ, S. D.; ARBÓ, D. G.

Ciudad Autónoma de Buenos Aires

Congreso; 103 Reunión de la Asociación de Física Argentina; 2018

When an intense short laser pulse interacts with an atom ionizing it, thephotoelectron spectra present several structures that can be understood asdouble slit interferences in the time domain, namely intra- andinter-cycle interferences [1]. This type of structures are formed byelectrons that emerge from the atom and follows directly to detector.There is another type of structures that requires interference of formerdirect electrons with other that interact with the parent core. In aclassical picture, the latter returns to the parent ion driven by thelaser fi eld and rescatters to the detector. It is well known that a shortrange potential is sufficient to understand the rescattering rings at highenergy, formed by very hard interaction among electron and ion [2]. Otherstructures can be explained only when long range coulombic interactionstake place. This type of structures can be interpreted as holograms, i.e.the interference pattern between the direct (reference) and therescattered (signal beam) electrons. In this way, the information of theinteraction is encoded in the interference pattern between the referenceandthe signal [3].In this work we present a theoretical analysis of interferences using anumerical solution of the time dependent Schrödinger equation (TDSE) andsemiclassical approaches, namely, quantum trajectory Monte Carlo (QTMC)and the semiclassical two step model (SCTS) [4]. We analyze the ionizationof atomic hydrogen to characterize the role that the long range Coulombinteraction plays in the holographic structures. Particularly, we focusour analysis for very few cycle laser pulses allowing ionization in someparts, to turn on and off different kind of interferences. Withsemiclassical approaches we can examine the trajectories that lead todifferent nal conditions and get a deeper understanding of the electronkinematics associated to holographic structures.[1] Arbó, D.G., Ishikawa, K.L., Schiessl, K., Persson, E., and Burgdörfer,J. Phys. Rev. A, 81, 021403 (2010).[2] Lewenstein, M., Kulander, K.C., Schafer, K.J., and Bucksbaum, P.H.,Phys. Rev. A, 51, 1495 (1995).[3] Huismans, Y., Rouzée, A., Gijsbertsen, A., et al., Science 331, 61(2011) .[4] Shvetsov-Shilovski, N. et al., Phys. Rev. A, 94, 013415 (2016).