A B
E. + VgJ'BO
| < --- g"AB I
AB = h B0=
R
Bo=0 Bo
Bo
Resonance field Br
Figure 2-13. A) Energy level diagram for a free electron in an applied magnetic field, and B)
corresponding derivative of absorption spectrum.
A B
1 1
--- (0,0)
= --1 (1,1) (-1,-1)
E AhE= hv= g /Bj
B-2 1
Bo=O -
Bo Bo
Figure 2-14. A) Energy diagram for a system with a free electron (ms = 12) undergoing hyperfine
interaction with the nucleus of nitrogen (m = 1), and B) representative derivative
EPR spectrum for a nitroxide spin label.
All EPR work described in this dissertation was collected at X-band, for which resonance
occurs at a magnetic field of approximately 3480 Gauss and 9.75 GHz. A list of fields for
resonance at varying microwave frequencies commonly available in EPR is given in Table 2-2.