All surface probe microscopy (SPM) techniques involve a probe
which interacts with a sample surface. Atomic...
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Chemistry
All surface probe microscopy (SPM) techniques involve a probewhich interacts with a sample surface. Atomic Force Microscopy(AFM) and Scanning Transmission Microscopy (STM) are two SPMtechniques that operate on the basis of different fundamentalprinciples, though they have many similar aspects. Describes theunderlying principles of AFM and STM for measuring surfaces
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Scanning TunnelingMicroscopy STMThe STM system is a surface imaging tool with subnano meterresolution Its working principle is based on quantum tunneling ofelectrons between the surface and the STM tip When the conductingtip of the STM is brought very close to a surface to be examined abias voltage is applied between the tip and the surface whichcauses electrons to tunnel through the intervening vacuum from thesurface to the tip resulting in a tunneling current As the tip ismoved across the surface changes in the surface height or densityof states cause measurable
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