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Podcasts›Scanning Tunneling Microscope - How Nanoscientists see Atoms›Another crystal moves it side to side.

Another crystal moves it side to side. artwork

Technology

Another crystal moves it side to side.

Scanning Tunneling Microscope - How Nanoscientists see Atoms by John C. Bean - WeCanFigureThisOut.org

Jul 24, 20170:15Technology

Another crystal moves it side to side. - Scanning Tunneling Microscope - How Nanoscientists see Atoms

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Continue listening to more episodes from Scanning Tunneling Microscope - How Nanoscientists see Atoms.

Scanning tunneling microscopes (STMs) allow nanoscientists to see individual atoms.

Jul 24, 2017 - 0:09

To see how a Nanosurf easyScan STM works, let's take it apart in virtual reality.

Jul 24, 2017 - 0:06

The heart of the STM is an atomically sharp probe.

Jul 24, 2017 - 0:15

A voltage induces electrons to jump from the probe's tip to the sample atoms.

Jul 24, 2017 - 0:16

A feedback loop holds the electron current constant by keeping the distance from probe to sample constant.

Jul 24, 2017 - 0:10

But how can it move the probe over these tiny nanometer distances?

Jul 24, 2017 - 0:12

Voltages to a piezoelectric crystal move the probe in and out.

Jul 24, 2017 - 0:23

A third crystal moves it up and down.

Jul 24, 2017 - 0:15