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Low - energy removal, Desorption of Atoms
Electrons can induce desorption of atoms and molecules from a surface
under vacuum. Scientists used electrons from a scanning tunneling microscope
tip to study this process for atomic hydrogen absorbed on the Si (100)
surface. In addition to higher energy electronic process, they see a lower
energy process, at 2 - 5 electron volts, in which multiple electrons vibrationally
excite the SI-Hi bond. These tunneling electrons allow patterns of disorbed
atoms to be formed with subnanometer structure.
Science VOL. 268 16 June 1995
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