The tunnelling current (1) obtained in STM is given by I oc e-kd Where d is the distance between the tip and the surface and k= 10 nm¹. Calculate the change in the tunnelling current when the tip is retracted vertically from the surface by 5% of its original distance of 1 nm. Explain the excellent vertical resolution that can be obtained using STM.
The tunnelling current (1) obtained in STM is given by I oc e-kd Where d is the distance between the tip and the surface and k= 10 nm¹. Calculate the change in the tunnelling current when the tip is retracted vertically from the surface by 5% of its original distance of 1 nm. Explain the excellent vertical resolution that can be obtained using STM.
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Transcribed Image Text:The tunnelling current (1) obtained in STM is given by
I oc e-kd
Where d is the distance between the tip and the surface and k= 10 nm¹. Calculate the change
in the tunnelling current when the tip is retracted vertically from the surface by 5% of its
original distance of 1 nm. Explain the excellent vertical resolution that can be obtained using
STM.
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