High Proton Polarization by Microwave-Induced Optical Nuclear Polarization at 77 K
PhysRevLett_84_171.pdf 81.6 KB
Shimizu, Hirohiko M.
Protons in naphthalene and p-terphenyl doped with pentacene have been polarized up to 32% and 18%, respectively, at liquid nitrogen temperature in a magnetic field of 0.3 T by means of microwave-induced optical nuclear polarization. The polarization was measured by nuclear magnetic resonance as well as by the neutron transmission method. The relaxation time of the proton polarization at 0.0007 T and 77 K was found to be almost 3 h and the polarization enhancement reached a record value of 8 × 104. The usefulness of the method in many areas of physics and chemistry is discussed.
Physical Review Letters
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American Physical Society
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Graduate School of Advanced Sciences of Matter