  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.
