Regular Article

Two-photon sequential double ionization of argon in the region of Rydberg autoionizing states of Ar^+⋆

¹ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
² Pacific National University, Tikhookeanskaya 139, 680035 Khabarovsk, Russia

^a e-mail: gryzlova@gmail.com

Received: 9 December 2018
Received in final form: 18 January 2019
Published online: 7 May 2019

Abstract

A theoretical study of two-photon sequential double ionization of Ar is presented for the photon energies in the region of Rydberg autoionizing states 3p⁴ (¹D) nl of the ion Ar⁺ overlapping with the particle-hole autoionizing states 3s3p⁶ np of neutral Ar. The atomic and ionic autoionizing states lead to sharp variations of the angular correlation function between the two outgoing electrons, as well as in the angular distributions of the first and the second emitted electrons. A strong influence of the second step ionization on the first ionization step is demonstrated.