Electron emission 6 Ion-surface collisions 4 Ionization 4 Ions 4 Lithium compounds 4 Protons 4 Surface phenomena 4 Aluminum 2 Angular distribution 2 Approximation theory 2 Atomic bound states 2 Band structure 2 Charge state 2 Convoy electrons 2 Crystals 2 Energy dissipation 2 Free electron gas 2 Glancing angles 2 Ground state 2 Hydrogen 2 Impact velocities 2 Ion surface collision 2 Ion-surface collision 2 Mathematical models 2 Modified spicular reflection 2 Molecular dynamics 2 Molecular interactions 2 Plasma collision processes 2 Projectile ionization 2 Quantum theory 2