An empty state STM image of a Si(100)-2x1 monohydride surface
after rows of H atoms being removed by the electrons from
the STM tip at a sample voltage of 3V via the multiple vibrational
excitation. The lines are 3nm apart and the tip moved from
the left side of a dimer row to the right side of the dimer
row. The brighter parts of the lines indicate only a single
H atom was removed from a dimer while the dimmer sections
with a central nodal line indicate both H atoms were removed
from a dimer.
[Science 268, 1590-1592 (1995)]
