Theoretical models to calculate stopping and ionization ratios of H 2 + molecules in solid targets

ARCHUBI, C. D.; ARISTA, N. R.

Physical Review A

American Physical Society-

Año: 2019 vol. 99

2469-9926

In this work we study the vicinage effects that arise in the interaction of molecular projectiles with solids,considering, in particular, the effects produced by the excitation of inner shells. For this purpose, we use twodifferent approaches. On one side we extend the use of the semiclassical impact-parameter model for theexcitation of atomic shells, considering quantum corrections and the role of target screening in the vicinageeffects. On the other hand, we adapt our extended wave-packet model, developed in a previous work tothe calculation of stopping ratios and ionization cross sections for correlated ions. This model introducesmodifications to the wave-packet method originally proposed by Kaneko, using the Levine and Louie techniqueto take into account the energy gaps corresponding to the different atomic levels of the target. Finally, we addthe contribution of valence electrons calculated with the Lindhard free-electron-gas model and compare withexperimental results of vicinage effects in the energy-loss and ionization cross sections for hydrogen moleculesinteracting with C, Al, Si, Al2O3, and SiO2 targets.