Experiments are reported on the detection of slow photoelectrons resulting from the photoionization of Xe atoms in a dc electric field by electron imaging. In the far-field photoelectron velocity distributions we can distinguish between direct and indirect ionization processes (involving long range Coulomb interactions with the Xe+ ion). Also, a new modulation of the velocity distribution is observed which cannot be explained by previously discussed mechanisms. Classical and quantum mechanical calculations are presented to support the interpretations.

Phys. Rev. Lett.

Nicole, C., Sluimer, I., Rosca-Pruna, F., Warntjes, M., Vrakking, M. J. J., Bordas, C., … Robicheaux, F. (2000). Slow photoelectron imaging. Phys.Rev.Lett., 85, 4024–4027.