# Bethe Stopping Power

1. Nov 27, 2009

### John2

The nonrelativistic Bethe stopping power function contains the constant 2*pi*N*e^4 where N is Avogadro's number and e is the electron charge. In the literature, this constant is often calculated to be 78,500. If calculate the constant, I get 606,235 (=2 * pi * 6.02214179E+23 mol^-1 *(1.602176487E-19 C)^4). Does anybody know what my mistake is?

Thank you.

2. Nov 27, 2009

### Bob S

Last edited: Nov 27, 2009
3. Nov 27, 2009

### John2

Thank you. That helped.