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Phys. Rev. Lett. 84, 171–174 (2000)

High Proton Polarization by Microwave-Induced Optical Nuclear Polarization at 77 K

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M. Iinuma*, Y. Takahashi, I. Shaké†, M. Oda‡, A. Masaike§, and T. Yabuzaki
Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan

H. M. Shimizu
The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351-0106, Japan

Received 12 January 1998; revised 21 July 1999; published in the issue dated 3 January 2000

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.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.171
DOI:
10.1103/PhysRevLett.84.171
PACS:
76.70.Fz, 24.70.+s, 29.25.Pj

*Present address: Graduated School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Higashi, Hiroshima, 739-8526, Japan.

†Present address: NTT Network Innovation Systems Laboratories, 1-1 Hikari-no-oka, Yokosuka, 239-0847, Japan.

‡Present address: Sanyo Micro-electronics Laboratories, 180 Ohmori, Anpachi-cho, Anpachi-gun, 503-0195, Japan.

§Present address: Faculty of Engineering, Fukui University of Technology, 3-6-1 Gakuen, Fukui-shi, Japan.

 
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