684 citations · 710 across the 4 of their papers we have counts for
1 paper · 1 filter
P. M. Echenique, J. M. Pitarke, E. V. Chulkov +1
The unequivocal observation in the early 1980s of a new class of unnocupied surface states that are bound to the vacuum level of a variety of metal surfaces has led over the last t…