We describe a home-made dynamic nuclear polarizatioD （DNP） spectrometer at a fieldof 1.94 T, corresponding to Larmor frequencies 83 MHz and 54 GHz for proton and electron,respectively. Its NMR part is a modified Bru...We describe a home-made dynamic nuclear polarizatioD （DNP） spectrometer at a fieldof 1.94 T, corresponding to Larmor frequencies 83 MHz and 54 GHz for proton and electron,respectively. Its NMR part is a modified Bruker WP--80SY spectrometer. A 6--mm EIO （ex-tended interaction oscillator） Klystron D3070, with a maximum output power of 30W in cwmode, served as the microwave source of ESR. In <sup>1</sup>H and <sup>13</sup>C DNP and DNP--CP （crosspolarization） experiments the probe consisted of a horn-antenna, a movable reflector and adouble-tuned circuit for <sup>1</sup>H and <sup>13</sup>C. The proton and carbon NMR signals were enhanced byone to two orders of magnitude for typical samples. Some results are presented in thispaper.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘We describe a home-made dynamic nuclear polarizatioD （DNP） spectrometer at a fieldof 1.94 T, corresponding to Larmor frequencies 83 MHz and 54 GHz for proton and electron,respectively. Its NMR part is a modified Bruker WP--80SY spectrometer. A 6--mm EIO （ex-tended interaction oscillator） Klystron D3070, with a maximum output power of 30W in cwmode, served as the microwave source of ESR. In <sup>1</sup>H and <sup>13</sup>C DNP and DNP--CP （crosspolarization） experiments the probe consisted of a horn-antenna, a movable reflector and adouble-tuned circuit for <sup>1</sup>H and <sup>13</sup>C. The proton and carbon NMR signals were enhanced byone to two orders of magnitude for typical samples. Some results are presented in thispaper.
