6) (5 points) In the special topic box in Section 6.7, the extreme sensitivity of scanning tunnelling microscopes (STM)

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6 5 Points In The Special Topic Box In Section 6 7 The Extreme Sensitivity Of Scanning Tunnelling Microscopes Stm 1 (26.8 KiB) Viewed 41 times

6) (5 points) In the special topic box in Section 6.7, the extreme sensitivity of scanning tunnelling microscopes (STM) was described. It was reported that a change in the tunnelling gap of only 0.4 nm between STM sample and probe can change the tunnelling current by a factor of 104. Check the plausibility of this statement by using the "wide-barrier" approximation in Equation (6.70) to find the difference between the electron energy and barrier height that would produce such a situation. Report your answer in eV and comment in the result