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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.15217 |
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Table of Contents:
- 1H polarization of 61% was achieved by Dynamic Nuclear Polarization using photoexcited triplet electrons (Triplet-DNP) at room temperature and in 0.64 T. We introduced dibenz[a, h]anthracene as a new host molecule of the polarizing agent, pentacene-d14. Its rigid structure provides a long spin-lattice relaxation time (T1) of more than 2 hours at room temperature. The single crystal of dibenz[a, h]anthracene doped with 0.05 mol% pentacene-d14 was grown by the Bridgman method, and cut into a small piece of ~1 mg for Triplet-DNP experiment. The 1H polarization buildup and relaxation measurements indicated that paramagnetic relaxation became the major source of the relaxation than spin-lattice relaxation. Finally, two promising applications of room-temperature hyperpolarization, i .e. nuclear ordering and radiation-tolerant polarized target, are discussed.