Calculating Energies of Pion - Seeming trouble with constants?

unicornflyers
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Homework Statement



Calculate the energy for 1S->2P transition in lithium and carbon. We had to calculate the energy and eigenvalue equations (though I verified these are correct)

Homework Equations


E = mc^2/sqrt(1+(Za/lambda)^2)
lambda = n + 1/2 + sqrt((l+1/2)^2- (Za)^2)


The Attempt at a Solution



The constants I tried were the mass of the pion =139.6 MeV
c = 3E8
Z =3
a = 7.29E-3 (Via CODATA)
and I'm assuming that n = 1, l =0.

When I plug these in, I get something WAY off. Like not even order of magnitude correct, off. So am I using the right constants? If not, which ones should I be using for these?
 
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Trying n=2; l=1 also fails. Any ideas?
 

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