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We experimentally investigate the effects of the linear photon momentum onthe momentum distributions of photoions and photoelectrons generated inone-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 impartedonto the photoion, which is essentially the system's center of mass.Nevertheless, the mean value of the ion momentum distribution along the lightpropagation direction is backward-directed by $-3/5$ times the photon momentum.These results experimentally confirm a 90 year old prediction.

Observation of Photoion Backward Emission in Photoionization of He and N2