Abstract
We discuss a specific quasifree mechanism (QFM) of the ionization processes, which requires only small momentum transfer to the nucleus. The QFM mechanism is important in the kinematical regions where the two-electron system can absorb a photon without participation of the nucleus. The QFM leads to the complicated shape of the double photoionization spectrum curve, providing the breakdown of the nonrelativistic high energy asymptotic of the double-to single photoionization ratio. Calculation of the QFM contribution requires a consistent theoretical approach. Use of oversimplified approximations leads to misleading results. In certain kinematical regions the QFM provides the leading contribution, and thus the results obtained without inclusion of QFM are erroneous. Experimental detection of QFM is a complicated, but interesting problem.
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