Dynamic nuclear polarization of proton spins via photoexcited triplet states: the system phenanthrene in fluorene |
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| Authors: | HW Van Kesteren WTh Wenckebach J Schmidt NJ Poulis |
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| Institution: | Kamerlingh Onnes and Huygens Laboratories, 2311 SB Leyden, The Netherlands |
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| Abstract: | The proton spins in a single crystal of fluorene have been polarized by dynamic nuclear polarization via the photoexcited triplet state of phenanthrene guest molecules. It is possible to reach an enhancement of the proton polarization of 90 at 1.2 K where the thermal equilibrium polarization is 0.033%. |
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