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The 9 GHz EPR Imager for Thin Materials: an Application to Surface Detection

机译：薄材质的9 GHz EPR成像仪：表面检测的应用

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A 9 GHz EPR imager that is capable of imaging surface area of the thin-materials has been built. The EPR imager resolved samples spaced by 1 mm. The developed TE111 cavity was able to detect easily ~1.1 mM aqueous TEMPOL solution in ~1.0 mm (i.d.) glass capillary placed just above the cavity. The theoretical sensitivity of the TE111 cavity was estimated to be ~1.3-fold in comparison with the JEOL TE011 cavity considering the same quality factor (Q). The sensitivity measured using the TEMPOL solution showed ~0.33 of that for the JEOL cavity, which was in a qualitative agreement with the calculations considering the difference in the filling factors of the cavities. The relatively low measured sensitivity of the TE111 cavity is due to utilization of microwave field leakage from a small hole in the cavity wall. More importantly, the TE111 cavity does not require inserting sample into the inner volume of the cavity as well as placing samples into EPR tubes. Therefore, we can use the maximum imager microwave power to gain the sample signal intensity.

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