Abstract The (e, 2e) triple-differential cross sections of Ag+(4p, 4s) were calculated based on the three-body distorted-wave Born approximation considering post-collision interaction in coplanar symmetric geometry. The energy of outgoing electron was set to be 50, 70, 100, 200, 300, 500, 700, and 1000 eV, and the intensity and splitting of forward and backward peaks were discussed in detail. Some new structures were observed around 15° and 85° for 4p and 4s orbitals. Structures in triple-differential cross sections at 15° have been reported for the first time. A double-binary collision was proposed to explain the formation of such structures. The structures at 85° were also considered as the result of one kind of double-binary collision.
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