CW EPR spectrum of P1 center in diamond should give three peaks of equal intensity under an aligned magnetic field B (Since B is equally inclined to all four possible NV orientations along the family.
However, my experimental data shows an intensity ratio of 1 : 2.5 : 1.
What can be the reason for this? cw EPR simulation using Easy spin also gives equal intensity peaks.
Thank You.
Hi,
I don't have experience with diamond defects but searching through some papers I've seen many spectra that have unequal ratios of signals. Some of them have many more signals which makes me think that there are several types of radicals. From seeing your spectrum I think you may have an additional signal corresponding to a species with no hyperfine splitting superimposed with the central N signal.
Although the signals look sharp it's possible that they have been broadened by modulation or digital filtering. I would recommend if possible to measure one spectrum with a lower modulation (0.04 mT, 0.02, 0.01 mT) but also either reducing the time constant or sweeping more slowly, to see if signals are resolved.
Best wishes
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