Time delay anisotropy in photoelectron emission from isotropic helium. (August 2015)

• Record Type: Journal Article
• Authors: Heuser, S; Jiménez-Gálan, Á; Cirelli, C; Sabbar, M; Boge, R; Lucchini, M; Gallmann, L; Ivanov, I; Kheifets, A; Dahlström, J M; Lindroth, E; Argenti, L; Martín, F; Keller, U
• Is Part Of: Journal of physics. Number 635(2015)
• Publication Date: 2015-08
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/635/9/092089
• Languages: English
• ISSNs: 1742-6588

Abstract

Synopsis: In contrast to expectations, we observe that the photoionization time delay from the 1 s 2 spherically symmetric ground state of He depend on the electron emission direction with respect to an external reference. We attribute the observed anisotropy to the interplay between different final quantum states, which become accessible once two photons are involved in the photoionization process. This is a universal effect, which needs to be taken into account for any study dealing with photoionization dynamics.