We apply an angular momentum coupling formalism to describe the angular correlation pattern in sequential two-photon double ionization of neon. Comparison with previous work (Fritzsche et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 165601 ) reveals some important differences which are discussed in terms of various ionization mechanisms and their theoretical implementations in two alternative approaches.
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A. S. Kheifets (2009) studied this question.