- #1
sid_galt
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I have some questions about barrier tunneling in a scanning tunneling microscope.
From what I know, the microscope consists of a one atom tip very close to the surface of the metal being examined. A potential difference is applied between the tip and the metal and some of the electrons manage to tunnel through the vacuum.
1) How is the potential energy barrier to the electrons formed with a vacuum?
2) How do physicists determine the energy of the electron at the negative electrode?
Could you also please give mathematical equations for barrier tunneling for cases like that of the ST Microscope where the barrier is not an electric or magnetic barrier?
Thanks in advance
From what I know, the microscope consists of a one atom tip very close to the surface of the metal being examined. A potential difference is applied between the tip and the metal and some of the electrons manage to tunnel through the vacuum.
1) How is the potential energy barrier to the electrons formed with a vacuum?
2) How do physicists determine the energy of the electron at the negative electrode?
Could you also please give mathematical equations for barrier tunneling for cases like that of the ST Microscope where the barrier is not an electric or magnetic barrier?
Thanks in advance