Dynamics of excited state production in the scattering of inert gas atoms and ions from Mg and Al surfaces

Kinetic electron emission from clean polycrystalline gold induced by impact of slowC+,N+Lörinčı́k1, Šroubek2, Eder3 et al. 2000Phys. Rev. B583210View full textAdd to dashboardCite

“…These collisions temporarily create ͑quasi-͒molecules in which some electronic levels may be sufficiently strongly promoted to higher orbital energies, and thus give rise to electron emission in subsequent deexcitation steps. 9,10 This KE mechanism will be called ''promotional KE ͑pKE͒'' in our paper. The pKE process is characterized by a threshold impact velocity v th,p or kinetic energy E th,p which strongly depends on the particular combination of the collision partners.…”

The role of atomic collisions in kinetic electron emission from Al surfaces by slow ions

“…This observation further confirms the assignment of this peaks, given in [17] in analogy with the case Ne + impact, to the decay of doubly excited sodium projectiles due to simultaneous promotion of two 2p electrons in binary collisions between target atoms and incoming ions which have survived neutralization processes in the interaction with the surface. Infact, the ground state configuration of a Na + ion is the same of Ne atom and, therefore, collisions involving incoming ions produce both the 2p 5 and the 2p 4 excited states [14] with the same threshold energy. On the other hand, at impact energies lower than 500 eV, the structures due to the decay of the singly excited 2p 5 states are the only atomic features appearing in the spectra.…”

“…Electron promotion occurs at the expense of the kinetic energy of incoming projectiles (kinetic electron emission -KEE) when close collisions temporarily create quasimolecules in which some electronic levels are promoted to higher orbital energies, giving rise to direct electron emission or delayed emission after Auger de-excitation [12] or after autoionization of excited states formed by electron capture [13,14].…”

Kinetic electron emission due to perpendicular impact of carbon ions on tungsten surfaces

“…Such processes have been analyzed in some detail in [9,14,[16][17][18] within the independent particle picture and several excitation mechanisms have been identified. The most conspicuous one is the process in which deep levels of the projectile or of the substrate atom or of their combination are promoted above the Fermi energy and subsequently loose electrons.…”