Merging of X-Ray photons in the field of a light atomic ion

Resumo

The process of merging of three X-ray photons into one photon in the field of a light atomic ion is theoretically studied. A pronounced resonance structure and a strong angular anisotropy of the differential cross section for merging are predicted in the region of the incident photon energy ħω ≅ I_1s /2 (I_1s is the threshold energy of ionization of the -shell of the ion). The magnitude of the observed merging cross section is estimated.