Force-detected ESR Measurements in a Terahertz Range up to 0.5 THz and Application to Hemin |
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| Authors: | Tsubasa?Okamoto mailto:t-okamoto@stu.kobe-u.ac.jp" title=" t-okamoto@stu.kobe-u.ac.jp" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author http://orcid.org/---" itemprop=" url" title=" View OrcID profile" target=" _blank" rel=" noopener" data-track=" click" data-track-action=" OrcID" data-track-label=" " >View author&# s OrcID profile,Hideyuki?Takahashi,Eiji?Ohmichi,Hitoshi?Ohta |
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| Affiliation: | 1.Graduate School of Science,Kobe University,Kobe,Japan;2.Organization for Advanced and Integrated Research,Kobe University,Kobe,Japan;3.Molecular Photoscience Research Center,Kobe University,Kobe,Japan |
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| Abstract: | ![]()
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. |
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