Observation of Photoion Backward Emission in Photoionization of He and N2

24 Mar 2020  ·  Grundmann Sven, Kircher Max, Vela-Perez Isabel, Nalin Giammarco, Trabert Daniel, Anders Nils, Melzer Niklas, Rist Jonas, Pier Andreas, Strenger Nico, Siebert Juliane, Demekhin Philipp V., Schmidt Lothar Ph. H., Trinter Florian, Schoeffler Markus S., Jahnke Till, Doerner Reinhard ·

We experimentally investigate the effects of the linear photon momentum on the momentum distributions of photoions and photoelectrons generated in one-photon ionization in an energy range of 300 eV $\leq~E_\gamma~\leq$ 40 keV. Our results show that for each ionization event the photon momentum is imparted onto the photoion, which is essentially the system's center of mass. Nevertheless, the mean value of the ion momentum distribution along the light propagation direction is backward-directed by $-3/5$ times the photon momentum. These results experimentally confirm a 90 year old prediction.

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Atomic Physics