Metastability Exchange Optical Pumping
3He can also be hyperpolarized using metastability exchange optical pumping (MEOP). This process is able to polarize 3He nuclei in the ground state with optically pumped 3He nuclei in the metastable state. MEOP only involves 3He nuclei at room temperature and at low pressure (≈a few mbars). The process of MEOP is very efficient (high polarization rate), however, compression of the gas up to atmospheric pressure is needed.
Read more about this topic: Hyperpolarization (physics)
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