The electron transfer between an F− ion and Cu(111) and Ag(111)
surfaces is studied by the wave packet propagation method in order to determine
specifics of the charge transfer interaction between the negative ion and the
metal surface due to the projected band gap. A new modeling of the F− ion
is developed that allows one to take into account the six quasi-equivalent
electrons of F− which are {\it a priori} active in the charge transfer
process. The new model invokes methods of constrained quantum dynamics. The
six-electron problem is transformed to two one-electron problems linked via a
constraint. The projection method is used to develop a wave packet propagation
subject to the modeling constraint. The characteristics (energy and width) of
the ion F− ion level interacting with the two surfaces are determined and
discussed in connection with the surface projected band gap.Comment: 34 pages, Revtex, 9 figures (postscript
