X-band 1H-DNP experiments and high power sub-THz wave irradiation effect on BDPA-doped toluene solution

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To investigate the experimental technique and the high magnetic field effect in the dynamicalnuclear polarization (DNP) experiments, the X-band 1H-DNP and the high power sub-THz waveirradiation experiments have been performed on bis-diphenylene-phenyl-allyl (BDPA)-dopedtoluene solution at room temperature. We have established the sample-shuttle X-band DNPexperimental system, and investigated the external magnetic field, the microwave power and 1H-T_1^-1dependences of Overhauser enhancement factor (e). A maximal signal enhancement ofapproximately –19 has been observed. As for the sub-THz wave experiments, we have constructedthe NMR and ESR measurement system for the experiments under the magnetic field of ~10.7 T,with a high power light source gyrotron CW-I (TE_<22,8> mode, f~299.23 GHz). When the high powersub-THz wave of a gyrotron was irradiated on the toluene solution in order to confirm the evidenceof DNP, the sample has evaporated due to the electromagnetic (EM) wave heating.