Auger-like correlations in the two-photon above threshold ionization of atoms and molecules in the vicinity of the giant resonance

Abstract

Synopsis The two-photon ionization of the Ne–CH4 and Ar–SH4 isoelectronic systems was studied theoretically for the photon energies exceeding the ionization threshold of the outer shells. The calculations demonstrate that the two-photon ionization of the investigated objects is almost entirely a collective process if the one-photon energy corresponds to the energy of the n ℓ → ε ℓ R ′ giant resonance. The largest contribution to the transition (2) amplitude stems from the Auger-like correlation n ℓ 2 → ( 2 ) ε ℓ R ′ 2 ⇒ n ℓ ε ″ ℓ ″ .