Two-electron photoionization of endohedral atoms

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Using He@C₆₀ as an example, we demonstrate that static potential of the fullerene core essentially alters the cross section of the two-electron ionization differential in one-electron energy dσ⁺⁺(ω)/dε. We found that at high photon energy prominent oscillations appear in it due to reflection of the second, slow electron wave on the % C₆₀ shell, which "dies out" at relatively high ε values, of about 2÷3 two-electron ionization potentials. The results were presented for ratios RC₆₀(ω,ε)≡ dσ⁺⁺(ω,ε)/dσᵃ⁺⁺(ω,ε), where dσᵃ⁺⁺(ω,ε)/dε is the two-electron differential photoionization cross section. We have calculated the ratio Ri,ful= σᵢ ⁺⁺(ω)/σᵢᵃ⁺⁺(ω), that accounts for reflection of both photoelectrons by the C₆₀ shell. We have calculated also the value of two-electron photoionization cross section σ⁺⁺(ω) and found that this value is close to that of an isolated He atom.