State-dependent strengths in direct 2p photo double ionization of neon

We report triple-differential cross-section measurements for the three 2p(4 ) (2S+1) L final states of direct photo double ionization in neon. Through comparison with a measurement under equivalent experimental conditions in h elium and through numerical integrations of the parameterizations for the r espective cross sections, all of the reported data are simultaneously put o n an absolute scale, and absolute values for the state-dependent total cros s sections in neon are given. The total cross sections are in agreement wit h a calculation far The direct process performed in many-body perturbation theory and show that a large fraction of the observed doubly charged ion yi eld is attributable to indirect two-step double ionization.