Can diffusion exist in this case?

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SUMMARY

This discussion centers on the existence of diffusion current in the context of electron behavior. Participants analyze the conditions under which diffusion can occur, specifically referencing the movement of electrons represented as small circles. The consensus indicates that diffusion current is indeed possible when electrons are subjected to a concentration gradient, leading to their movement from areas of high concentration to low concentration.

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anhnha
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Hi,
I want to ask if diffusion current can exist in the case:
Assuming that small circles are electrons.
attachment.php?attachmentid=59539&stc=1&d=1371184863.jpg
 

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Could anyone help?
 

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