INVESTIGADORES
BONETTO fernando Jose
artículos
Título:
Time - Energy Uncertainty and Electronic Correlation in H+ - Graphite Collisions
Autor/es:
F. BONETTO; M. A. ROMERO; A. IGLESIAS-GARCÍA; R. VIDAL; E. C. GOLDBERG
Revista:
JOURNAL OF PHYSICAL CHEMISTRY C
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2015
ISSN:
1932-7447
Resumen:
The
formation of negative ions in the scattering of protons by a highly oriented
pyrolytic graphite (HOPG) surface is theoretically and experimentally analyzed
for a large scattering angle and compared with previous results obtained in the
same system but for a forward scattering geometry. These experiments were
motivated by the fact that the interaction of a hydrogen atom with a surface is
the prototype system for studying the intra-atomic Coulomb repulsion in an
s-like valence orbital localized in the atom. We
tried to answer the open questions related to the electronic correlation
effects and the influence of the detailed surface band structure by using
appropriate theoretical models. The comparison with the experiment of
theoretical results obtained by using different limit approximations of the
electronic repulsion in the atomic state, shows the expected validity ranges
according to the ion velocity. However, the most remarkable conclusion obtained
from this comparison is the non-validity of an adiabatic picture of the energy
levels shifted by the interactions with the surface atoms, when the energy
uncertainty introduced by the ion velocity becomes of the order of the
electronic repulsion in the hydrogen ground state.