Angular dependence of photoemission time delay in helium

Heuser, S., Galán, A.J., Cirelli, C., Marante, C., Sabbar, M., Boge, R., Lucchini, M., Gallmann, L., Ivanov, I., Kheifets, A.S., Dahlström, J.M., Lindroth, E., Argenti, L., Martín, F., Keller, U.
Physical Review A , 2016 , 94 ,DOI: 10.1103/PhysRevA.94.063409