Magnetic Field Orbital Splitting

MrMultiMedia
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Hi friends. I'm doing a homework problem about how degenerate orbitals split in the presence of a magnetic field. I understand everything, but I was just had a question about notation.

ΔE, the energy between degenerate orbitals in a magnetic field equals μB = (e*hbar/2m)B

I was just wondering what the m is? Is it mass? Since I'm using the hydrogen atom, do I just use the mass of the hydrogen atom? Thanks,

-MMM
 
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No, it is the mass of the electron.
 

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