In addition, upon comparing ( ) and ( ), we see that the growth of the SE scales quadratically with ω1S while linearly for RM. In addition, in a low magnetic field the SE becomes less resolved so the SE and RM will be more difficult to distinguish. Thus, we expect that RM is most easily distinguished from the SE in a high magnetic field using weak microwave irradiation. Additionally, according to (18), a shorter T2S and T2I can lead to a stronger RM/SE ratio. This may potentially explain why RM is more significant with a higher radical concentration . Of course, it is more complicated, as T1S and T1I are also affected by the electron spin concentration.