Geometry effects on the (e,2e) triple differential cross sections of Li+, Na+, and K+

The three-body distorted-wave Born and impulse approximations with spin-ave raged static exchange potential have been used to calculate the electron-im pact triple-differential ionization cross sections (TDCS's) of Li+, Na+, an d K+ ions in different geometries and kinematics. In coplanar geometry at h igh incident energy (>500 eV) and scattering angle similar to 10 degrees, b oth recoil and binary peaks split into two in case of p-electron targets (N a+ and K+ ions). In noncoplanar geometry a strong interference resulting in a dip in TDCS's has been noticed. In the perpendicular plane geometry, sin gle- and double-scattering mechanisms together produce an oscillatory struc ture in the TDCS's of a K+ ion. The values of the binary-to-recoil peak rat io for specific values of the momentum transfer have been determined to und erstand collision dynamics. [S1050-2947(99)10301-9].