Enhancement of solid-state proton NMR via SPINOE with laser-polarized   xenon
  We have first successfully transferred the 129Xe polarization of natural isotopic composition to the proton of solid-state 1HCl via Spin Polarization-Induced Nuclear Overhauser Effect (SPINOE), by mixing the hyperpolarized 129Xe gas and the 1HCl gas and then cooling them to their condensated state in a flow system. The solid-state enhanced factor of the NMR signal of 6 for 1H was observed, and the equation of solid-state polarization enhancement via cross relaxation has also been theoretically deduced. Using this equation, the theoretically calculated enhancement is in agreement with the measured value within error. Also, this technique is maybe useful to establish a solid state NMR quantum computer. 
Xin Zhou, Jun Luo, Xian-ping Sun, Xi-zhi Zeng, Shang-wu Ding, Mai-li   Liu, Ming-sheng Zhan