Two-color polarization control of angularly resolved attosecond time delays

Abstract

Measured photoionization time delays may exhibit large variations as a function of the emission angles, even for spherically symmetric targets, as shown in recent reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) experiments. The contributions from different pathways to the two-photon quantum channels can explain the observed phase jumps that shape those angular distributions. Here we propose a simple analytical model to describe angularly resolved RABBITT spectra as a function of the relative polarization angle between the ionizing attosecond pulse train and the assisting IR field. We demonstrate that the angular dependences of the measured delays can be analytically predicted and the position of the phase jumps reduced to the analysis of a few relevant parameters.