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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Methods Enzymol. 2015 Jul 21;563:171–208. doi: 10.1016/bs.mie.2015.06.025

Figure 1.

Figure 1

(A) Zeeman splitting of the degenerate electronic spin states for an S=1/2 system. (B) An electron can absorb energy to make a transition to the excited state resulting in an EPR absorption line. (C) Typical experimental EPR resonance line. The point where the line crosses the baseline determines the resonance magnetic field, B0, which allows the determination of the g-factor of the system.