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The commercially available cement Picein 80 has been tested and successfully used for the determination of g- factors and spin concentrations at X- and Q-band frequencies. The main advantages compared to other standards are a very small space requirement and the fact that the concentra­tion of the standard can be easily adjusted to the signal intensities of the sample. This standard exhibits a single line at a g-factor of 2.0041 with a halfwidth of .47 mT and a spin concentration of 2.10 15  spins/mg Picein. An additional weaker resonance occurs at g = 2.0177, and at Q-band a partly overlapping multiplet with 5.8 mT separation is observable, but the intensities of both signals are low com­pared to that of the main signal. This standard is applicable over the whole range of useful spin concentrations, and the linewidth makes it particularly useful for measurements on transition metal ions in diluted single crystals.

A Simple and Convenient EPR Standard for Determination of g-Factors and Spin Concentrations