A Surface Is Examined Using a Scanning Tunneling Microscope (STM)

question 33

Multiple Choice

A surface is examined using a scanning tunneling microscope (STM) .For the range of the working gap,L,between the tip and the sample surface,assume that the electron wave function for the atoms under investigation falls off exponentially as .The tunneling current through the STM tip is proportional to the tunneling probability.In this situation,the ratio of the current when the STM tip is 0.425 nm above a surface feature to the current when the tip is 0.465 nm above the surface is

• A)1.49.
• B)2.45.
• C)2.98.
• D)3.18.
• E)3.32.

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