Production of hyperpolarized 129Xe gas without nitrogen by optical pumping at 133Cs D2 line in flow system

We report production of hyperpolarized Xe-129 gas via spin-exchange with optically pumped Cs atoms at the D-2 line, achieved at low magnetic field in a flow system and in the absence of nitrogen gas. The nuclear spin polarization of hyperpolarized Xe-129 gas is enhanced by a factor of 10000 compared to that without optical pumping under the same condition, which corresponds to polarization of about 2.66%. Due to the high spin polarization, the radiation damping of hyperpolarized Xe-129 gas has also been observed in the flow system.