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a number of books and web articles says that the minimum field required is ≈[itex]10^7V/cm[/itex] for electrons field emission/tunneling from the surface of metals.

But fowler-nordheim formula shows that there is still considerable amount of field emission

current density (mA/cm2) even at lower fields of order [itex]10^4V/cm[/itex], for the same

tunneling barrier.

What is the truth..??

Any answers would be greatly appreciated!

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# Field Emission

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