Photo-electric effect and elementary charge

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I need to design a lab that would determine the elementary charge(charge of an electron). We can not use Millikan's oil drop idea, we have to come up with our own and it has to work. I was thinking of maybe incorporating the photo electric effect but I'm unsure of how to do it.:smile:
 
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Are you allowed to use the mass of an electron as a given?
 
Yes, that would make it very easy. Just measure deflection of an e-beam.

Alternatively, you could make the electron mass a negligible factor. If you have the means to create an ion beam. I believe there are ion sources of gallium or silicon.

Njorl
 

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