Force-detected ESR Measurements in a Terahertz Range up to 0.5 THz and Application to Hemin


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We report a novel force-detected high-frequency electron spin resonance (HFESR) technique using a microcantilever in the terahertz region. In this technique, we attach a tiny sample on the microcantilever end and the ESR signal is detected as the cantilever bending. The bending is sensitively detected by fiber-optic Fabry–Perot interferometry. We applied this technique to a tiny amount (~16 ng) of metalloporphyrin, a model substance of hemoproteins, and successfully observed ESR signals at multiple frequencies up to 0.5 THz. This result indicates that the sample volume needed in multi-frequency HFESR can be greatly reduced by several orders of magnitude, and our novel technique would be a promising tool for HFESR studies of metalloproteins in the future.

Sobre autores

Tsubasa Okamoto

Graduate School of Science, Kobe University

Autor responsável pela correspondência
Email: t-okamoto@stu.kobe-u.ac.jp
ORCID ID: 0000-0003-4178-4588
Japão, 1-1 Rokkodai-cho, Kobe, Nada, 657-8501

Hideyuki Takahashi

Organization for Advanced and Integrated Research, Kobe University

Email: t-okamoto@stu.kobe-u.ac.jp
Japão, 1-1 Rokkodai-cho, Kobe, Nada, 657-8501

Eiji Ohmichi

Graduate School of Science, Kobe University

Email: t-okamoto@stu.kobe-u.ac.jp
Japão, 1-1 Rokkodai-cho, Kobe, Nada, 657-8501

Hitoshi Ohta

Molecular Photoscience Research Center, Kobe University

Email: t-okamoto@stu.kobe-u.ac.jp
Japão, 1-1 Rokkodai-cho, Kobe, Nada, 657-8501

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