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Application of Continuously Frequency-Tunable 0.4 THz Gyrotron to Dynamic Nuclear Polarization for 600 MHz Solid-State NMR

  • Yoh Matsuki
  • Keisuke Ueda
  • Toshitaka Idehara
  • Ryosuke Ikeda
  • Kosuke Kosuga
  • Isamu Ogawa
  • Shinji Nakamura
  • Mitsuru Toda
  • Takahiro Anai
  • Toshimichi Fujiwara
Article

Abstract

In this paper we present results that demonstrate the utility of a continuously frequency-tunable 0.4 THz-gyrotron in a dynamic nuclear polarization (DNP)-enhanced solid-state NMR (SSNMR) spectroscopy at one of the highest magnetic fields, B 0 = 14.1 T (600 MHz for 1H Larmor frequency). Our gyrotron called FU CW VI generates sub-mm wave at a frequency near 0.4 THz with an output power of 4–25 W and a tunability over a range of more than 1 GHz by sweeping the magnetic field at the gyrotron cavity. We observed overall down shifting of the central frequency by up to ~1 GHz at high radiation duty factors and beam current, presumably due to the cavity thermal expansion by a heating, but the tunable range was not significantly changed. The frequency tunability facilitated the optimization of the DNP resonance condition without time-consuming field-sweep of the high-resolution NMR magnet, and enabled us to observe substantial enhancement of the SSNMR signal (ε DNP = 12 at 90 K).

Keywords

Gyrotron Dynamic nuclear polarization Solid-state NMR High-field spectroscopy 

Notes

Acknowledgment

This research is partly supported by SENTAN, JST and Targeted Proteins Research Program, MEXT.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Yoh Matsuki
    • 1
  • Keisuke Ueda
    • 1
  • Toshitaka Idehara
    • 2
  • Ryosuke Ikeda
    • 2
  • Kosuke Kosuga
    • 2
  • Isamu Ogawa
    • 2
  • Shinji Nakamura
    • 3
  • Mitsuru Toda
    • 3
  • Takahiro Anai
    • 3
  • Toshimichi Fujiwara
    • 1
  1. 1.Institute for Protein ResearchOsaka UniversityOsakaJapan
  2. 2.Research Center for Development of Far-Infrared RegionUniversity of FukuiFukuiJapan
  3. 3.JEOL RESONANCETokyoJapan

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