Recoil-ion and electron momentum spectroscopy is a rapidly developing technique that
allows one to measure the vector momenta of several ions and electrons resulting from …

Simultaneous ionization and excitation of helium atoms by 500 eV electron impact is
observed by a triple coincidence of an ionized slow electron, the recoiling He+ ion, and the …

The general description of simultaneous electron-impact ionization–excitation processes is
reformulated in terms of an irreducible tensor representation. Using a numerical model, in …

Over the last decade, it has become clear that for heavy ion projectiles, the projectile's
transverse coherence length must be considered in theoretical models. While traditional …

Triple differential cross sections (TDCSs) for electron vortex projectile ionization of helium
into the azimuthal plane are calculated using the distorted wave Born approximation. In this …

The electron-photon coincidence/correlation methods have been used to study the influence
of the 3ℓnℓ'autoionizing states in helium on simultaneous ionization-excitation to the …

We report on (e, 2e) experiments for excitation-ionization of helium made in asymmetric
geometry at intermediate incident energy and low momentum transfer. The results are …

The Auger effect must be interpreted as the radiationless counterpart of photoionization and
is usually described within a two-step model. Angle and spin resolved Auger emission …

This work presents an experimental study of fragmentation of helium by electron impact, in
which absolute fully differential cross sections for single ionization, ionization-excitation and …

Experimental magnetic sublevel scattering-angle-integrated cross sections following
ionization–excitation of He (1s 2) 1 S to He+(2p) 2 P o in e−+ He and H m++ He (m= 1–3) …