Hyperpolarization of Thin Films with Dynamic Nuclear Polarization Using Photoexcited Triplet Electrons

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  • Kenichiro Tateishi
    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • Makoto Negoro
    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • Akinori Kagawa
    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • Tomohiro Uesaka
    RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
  • Masahiro Kitagawa
    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

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With dynamic nuclear polarization using the photoexcited triplet electron spin (triplet-DNP) of pentacene, nuclear spins can be hyperpolarized even in a low magnetic field at room temperature. Several demonstrations have been performed using bulk crystals. Hyperpolarization in a thin film with triplet-DNP enables new applications, such as general NMR spectroscopy and the polarized target of unstable nuclei. In this work, we succeeded in polarizing 1H spins in a thin film fabricated by the cell method. We obtained a 1H spin polarization of 12.9% using a 7-μm-thick film of \(p\)-terphenyl doped with pentacene in 0.4 T at room temperature. We also obtained a 1H spin polarization of 3.9% in 0.4 T at 150 K using a 60-μm-thick film of trans-stilbene doped with pentacene, whose single crystal cannot be made easily by conventional methods.

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