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Bethe Stopping Power

by John2
Tags: bethe, power, stopping
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John2
#1
Nov27-09, 12:04 PM
P: 2
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.
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Bob S
#2
Nov27-09, 02:26 PM
P: 4,663
I usually use the Bethe Bloch equation in the form
http://en.wikipedia.org/wiki/Bethe_formula
and substitute

e2/(4 pi ε0) = re mec2
where re is the classical electron radius (2.818 x 10-13 cm) and
mec2 is the electron rest mass
which is 511,000 eV (one of which cancels in the denominator)

See my posts #8 and #9 in thread
http://www.physicsforums.com/showthread.php?t=332899

Bob S
John2
#3
Nov27-09, 05:13 PM
P: 2
Thank you. That helped.


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