Nakagawa Kouichi, Ohba Yasunori, Epel Boris, Hirata Hitoshi
Department of Radiological Life Sciences, Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-Cho, Hirosaki 036-8564, Japan.
J Oleo Sci. 2012;61(8):451-6. doi: 10.5650/jos.61.451.
A 9 GHz EPR imager that is capable of the imaging surface area of thin materials has been built. The EPR imager resolved samples spaced 1 mm apart. The developed TE(111) cavity was able to detect easily ~1.0 mM aqueous TEMPOL solution in ~1.0 mm (i.d.) glass capillary placed just above the cavity. The sensitivity measured using the TEMPOL solution showed ~0.3 of that for the modified 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 TE(111) cavity is due to utilization of the microwave field from ~3 mm aperture (hole) in the cavity wall. More importantly, the TE(111) cavity does not require inserting the sample into the cavity and placing samples into EPR tubes.
已制造出一种能够对薄材料的表面区域进行成像的9 GHz电子顺磁共振成像仪。该电子顺磁共振成像仪能够分辨间距为1毫米的样品。所开发的TE(111)腔能够轻松检测位于腔上方的内径约1.0毫米的玻璃毛细管中约1.0 mM的TEMPOL水溶液。使用TEMPOL溶液测量的灵敏度约为改良的日本电子(JEOL)腔的0.3,这与考虑腔填充因子差异的计算结果在定性上是一致的。TE(111)腔测得的灵敏度相对较低是由于利用了来自腔壁上约3毫米孔径(孔)的微波场。更重要的是,TE(111)腔不需要将样品插入腔内,也不需要将样品放入电子顺磁共振管中。