Detection of rare nuclear spins with dymanic nuclear polarization using photoexcited triplet electron

• Project/Area Number: 25887054
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: The Institute of Physical and Chemical Research
• Principal Investigator: TATEISHI Kenichiro 独立行政法人理化学研究所, 仁科加速器研究センター, 特別研究員 (80709220)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 核磁気共鳴 / 動的核偏極 / 磁気共鳴

Outline of Final Research Achievements

Improvement of the sensitivity of NMR by enhancing spin polarization is proposed. Protons in samples were polarized by dynamic nuclear polarization using photoexcited triplet electron. We have realized 1) 18,000 times signal enhancement of 1H spin in the single crystal of p-terphenyl doped with pentacene, and 2) more than 1,000 times signal enhancement of 19F spin in the glass of o-terphenyl doublly doped with pentacene and trifluoro-benzoicacid. We also tried to enhacene the signal intensity of13C spin.

Research Products

• [Journal Article] Dynamic Nuclear Polarization with Photoexcited Triplet Electrons in a Glassy Matrix (2013)
  • Author(s): Kenichiro Tateishi, Makoto Negoro, Akinori Kagawa, and Masahiro Kitagawa
  • Journal Title: Angewandte Chemie International Edition Volume: 52 Issue: 50 Pages: 13307-13310
  • DOI: 10.1002/anie.201305674
  • Peer Reviewed
• [Presentation] 光励起三重項電子スピンを用いたDNPによる室温下での偏極率40%の達成 (2014)
  • Author(s): 立石 健一郎,月花 智博, 浦田 佳治, 西田 辰介, 森田 靖, 和田 智之, 上坂友洋
  • Organizer: 第53回NMR討論会
  • Place of Presentation: 大阪府吹田市 大阪大学
  • Year and Date: 2014-11-04 – 2014-11-06
• [Presentation] ガラス媒質中での光励起三重項電子スピンを用いた動的核偏極 (2014)
  • Author(s): 立石 健一郎, 根来 誠, 香川 晃徳, 北川 勝浩
  • Organizer: 第55回固体NMR・材料フォーラム
  • Place of Presentation: 神奈川県横須賀市 防衛大学校
  • Year and Date: 2014-05-14 – 2014-05-15
• [Presentation] 光励起三重項電子スピンを用いた動的核偏極による 固体陽子スピン偏極 (2014)
  • Author(s): 立石 健一郎, 月花 智博, 浦田 佳治, 和田 智之, 上坂友洋
  • Organizer: 日本物理学会 2014年春季大会
  • Place of Presentation: 神奈川県 東海大学湘南キャンパス
• [Presentation] 光励起三重項電子スピンを用いたDNPによる室温下での偏極率34%の達成 (2013)
  • Author(s): 立石健一郎,根来誠,西田辰介,香川晃徳,森田靖,北川勝浩
  • Organizer: 第52回 NMR討論会
  • Place of Presentation: 石川県立音楽堂