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Diamond has been extensively investigated recently due to a wide range ofpotential applications of nitrogen-vacancy (NV) defect centers existing in adiamond lattice. The applications include magnetometry and quantum informationtechnologies, and long decoherence time ($T_2$) of NV centers is critical forthose applications. Although it has been known that $T_2$ highly depends on theconcentration of paramagnetic impurities in diamond, precise measurement of theimpurity concentration remains challenging. In the preset work, we show amethod to determine a wide range of the nitrogen concentration ($n$) in diamondusing a wide-band high-frequency electron spin resonance and doubleelectron-electron resonance spectrometer. Moreover, we investigate $T_2$ of thenitrogen impurities and show the relationship between $T_2$ and $n$. The methoddeveloped here is applicable for various spin systems in solid andimplementable in nanoscale magnetic resonance spectroscopy with NV centers tocharacterize the concentration of the paramagnetic spins within a microscopicvolume.

Measurement of paramagnetic spin concentration in a solid-state system using double electron-electron resonance