# Electronic charge

1. Mar 26, 2015

### cwetteland

OK need some help with units. I am trying calculate the energy to surmount the coulomb barrier. the relationship is basic, but I cant remember how the units of e2 (1.440 ev nm) come about. thanks

2. Mar 27, 2015

### Simon Bridge

... they don't - that figure is incorrect.
It is $ke^2$ that has dimensions of energy-length.

See http://mypages.iit.edu/~johnsonpo/250310.pdf p1.