Dissolution DNP (dDNP) is an alternative for hyperpolarizing 129Xe to the well acknowledged method spin exchange optical pumping (SEOP). As opposed to SEOP, DNP takes place in the solid state at very low temperatures. Therefore, it can potentially produce a large volume of hyperpolarized gas after dissolution. In this study, by implementing a new way of preparing the sample, we ease the overall process and establish a superior incorporation of the gas atoms into the solvent. Additionally, due to a surprisingly short radical electron T1, we show that a higher polarization was achieved by applying microwave frequency modulation.
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