A filled 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. Rows of single protrusions indicate only a single H atom
was removed from a dimer while the brighter sections with
twice width indicate both H atoms were removed from a dimer.
[Science 268, 1590-1592 (1995)]
