A 9 GHz EPR imager for thin materials: Application to surface detection

Kouichi Nakagawa, Yasunori Ohba, Boris Epel, Hitoshi Hirata

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)451-456
Number of pages6
JournalJournal of oleo science
Issue number8
Publication statusPublished - 2012


  • DPPH
  • EPR
  • ESR cavity
  • Free radical
  • Imaging
  • Skin
  • Surface detection

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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