High proton polarization by microwave-induced optical nuclear polarization at 77 K
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 8x10(4). The usefulness of the method in many areas of physics and chemistry is discussed.
Iinuma
M
Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan.
Takahashi
Y
Shake
I
Oda
M
Masaike
A
Yabuzaki
T
Shimizu
HM