Collisional excitation in Neon-like projectiles scattered from Al

Plasmon Excitation in the Interaction of Slow Singly Charged Argon Ions with Magnesium

“…In the case of Neon projectiles, the spectra show also features due to kinetic emission: the low energy peak due to electrons excited in the cascade of electronic collisions inside the solid, and two lines at energies around 20-25 eV due to the autoionization of Ne 2p 4 3s 2 excited by electron promotion in violent binary atomic collisions with surface atoms [42][43][44][45]. These last peaks have been recently investigated for the information they provide in the electronic processes that occur in ion-solid interactions [46][47][48][49] and are not correlated to plasmon excitation [32]. In the case of Neon, PEE produces two broad features in the spectra of emitted electrons, due respectively to the Auger Neutralization and the Plasmon assisted neutralization processes.…”

On the correlation of angular distributions of keV ions and trajectory-dependent electronic excitations in transmission channelling geometry

“…In the MeV regime, the measured effects are expected to be governed by inner-shell excitations [17], which are mostly inaccessible during channelling, with limited variation for different channelling trajectories [18,19]. For keV ions heavier than hydrogen, the nature of the measured differences in energy loss is rooted in the frequent exchange of electrons between projectile and target electronic structure, including formation of molecular orbitals for heavier projectiles and the strong impact parameter dependence of these dynamic interactions [20][21][22]. These processes requiring close collisions cannot only explain earlier observed non-linearities in the stopping power of ions heavier than protons [23][24][25] but are also expected to leave a fingerprint in the energy loss along different trajectories developed during channelling.…”