Answer:
STM = Scanning Tunneling Microscope
Step-by-step explanation:
STM and its significance
It is the microscope that can take images of the particles at the atomic scale.It opens the door to under the nano-scale process .
In 1986 Heinrich Rohrer won the nobel prize for its discovery
It doesn't magnify images like other microscopes .
It uses the principle of quantum tunneling.
Working :
A fine needle like tip is scanned on the surface of electrically conducting sample. When voltage is applied , the electron jumps between the suface of the tip and sample . This flow of electron is detected by the detector. It can resolve the image upto 0.000000001 m or 1 nm (nanometer)
Uses :
- The STM is used in molecular science called nanotechnology to study nano phenomenon
- Its prototype AFM are used to Study wide range of Nano-particles
- STM is used in atomic deposition of metals with required scientific pattern, which can be used as nanodevices themselves.
- It is used to study electron-friedel oscillation on the surface of metals.
- It is used to modify sample surface.