Abstract. We propose a model for the triple photoionization of Be in which a core 1s electron absorbs the photon γ + 1s²2s²Be → ₁p + 1s2s²Be⁺ and the valence 2s² electrons are shaken off into continuum due to the sudden change of the core potential. We decompose the double shake-off amplitude into a single shake-off 2s² → nss and a subsequent electron impact ionization of the doubly charged Be²⁺ ion s + 1sns Be²⁺ → ₂l + ₃l + 1s Be³⁺. The latter process is described by the T-matrix of inelastic electron scattering on the 'semi-hollow' 1sns Be²⁺ ion in the monopole singlet channel. The convergent close-coupling method is used to evaluate the T-matrix.

Print publication: Issue 13 (14 July 2003)
Received 2 April 2003
Published 16 June 2003