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Ionization collisions have important consequences in many physical phenomena,and the mechanism that leads to ionization is not universal. Doubledifferential cross sections (DDCSs) are often used to identify ionizationmechanisms because they exhibit features that distinguish close collisions fromgrazing collisions. In the angular DDCS, a sharp peak indicates ionizationthrough a close binary collision, while a broad angular distribution points toa grazing collision. In the DDCS energy spectrum, electrons ejected through abinary encounter collision result in peak at an energy predicted from momentumconservation. These insights into ionization processes are well-established forplane wave projectiles. However, the recent development of sculpted particlewave packets reopens the question of how ionization occurs for these newparticle wave forms. We present theoretical DDCSs for (e,2e) ionization ofatomic hydrogen for electron vortex projectiles. Our results predict that theionization mechanism for vortex projectiles is similar to that of non-vortexprojectiles, but that features in the DDCS that distinguish ionizationmechanisms are obscured by the projectile's momentum uncertainty. Additionally,the projectile's non-zero transverse momentum increases the cross section forhigh energy ejected electrons.

Electron Spectra for Twisted Electron Collisions