High proton polarization by microwave-induced optical nuclear polarization at 77 K
High proton polarization by microwave-induced optical nuclear polarization at 77 K
复制标题
77 K 微波诱导光学核极化实现高质子极化
作者：
Iinuma;Takahashi;Shake;Oda;A Masaike;Yabuzaki;Shimizu
在液氮温度下，在0.3 T的磁场中，掺并五苯的萘和对三苯中的质子通过微波诱导光核极化分别极化了32%和18%。用核磁共振和中子透射法测量了极化。在0.0007 T和77 K下，质子极化的弛豫时间接近3 h，极化增强达到8 × 10的记录值(4)。讨论了该方法在物理和化学的许多领域中的实用性。
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.