DOUBLE-IONIZATION MECHANISMS AND ASYMMETRY PARAMETERS FOR (E,3E-1E) REACTIONS

In this work the cross section for the coincident detection of two ele ctrons following double ionization of helium by fast electrons is anal yzed. Structures arising in cross sections are associated with ionizat ion mechanisms. The role of electronic correlations is elucidated. The theory is compared with available experimental data and suggestions f or future experiments are made where results can be analyzed in terms of generalized asymmetry parameters and directly linked with well stud ied asymmetry parameters for double photoionization. Further, a method of calibrating relative (e,3e-1e) cross sections to double photoioniz ation cross sections is proposed.