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Volume 13: Pages 458-464, 2000
State‐Dependent Strengths in Direct 2p Photo Double Ionization of Neon
N. Scherer 1, B. Krässig 2, V. Schmidt 3
1Fakultät für Physik, Hermann‐Herder‐Str. 3, D‐79104 Freiburg, Germany
2Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439 U.S.A.
3Fakultät für Physik, Hermann‐Herder‐Str. 3, D‐79104 Freiburg, Germany
We report triple‐differential cross‐section measurements for the three 2p4 2S+1L final states of direct photo double ionization in neon. Through comparison with a measurement under equivalent experimental conditions in helium and through numerical integrations of the parameterizations for the respective cross sections, all of the reported data are simultaneously put on an absolute scale, and absolute values for the state‐dependent total cross sections in neon are given. The total cross sections are in agreement with a calculation for the direct process performed in many‐body perturbation theory and show that a large fraction of the observed doubly charged ion yield is attributable to indirect two‐step double ionization.
Keywords: photo double ionization in neon, state‐dependent triple‐differential and total cross sections, direct and sequential processes
Received: April 18, 2000; Published online: December 15, 2008