On the Tuning of High-Resolution NMR Probes

被引:11
作者
Poeschko, Maria Theresia [1 ]
Schlagnitweit, Judith [1 ]
Huber, Gaspard [2 ]
Nausner, Martin [1 ]
Hornicakova, Michaela [1 ]
Desvaux, Herve [2 ]
Mueller, Norbert [1 ]
机构
[1] Johannes Kepler Univ Linz, Inst Organ Chem, A-4040 Linz, Austria
[2] CEA Saclay, Lab Struct & Dynam Resonance Magnet, SIS2M UMR CEA CNRS 3299, CEA,IRAMIS,NIMBE, F-91191 Gif Sur Yvette, France
基金
奥地利科学基金会;
关键词
analytical methods; magnetic properties; NMR spectroscopy; radiation damping; spin noise; NUCLEAR-SPIN-NOISE; MAGNETIC-RESONANCE; SPECTRA; RATIO;
D O I
10.1002/cphc.201402236
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Three optimum conditions for the tuning of NMR probes are compared: the conventional tuning optimum, which is based on radio-frequency pulse efficiency, the spin noise tuning optimum based on the line shape of the spin noise signal, and the newly introduced frequency shift tuning optimum, which minimizes the frequency pushing effect on strong signals. The latter results if the radiation damping feedback field is not in perfect quadrature to the precessing magnetization. According to the conventional RLC (resistor-inductor-capacitor) resonant circuit model, the optima should be identical, but significant deviations are found experimentally at low temperatures, in particular on cryogenically cooled probes. The existence of different optima with respect to frequency pushing and spin noise line shape has important consequences on the nonlinearity of spin dynamics at high polarization levels and the implementation of experiments on cold probes.
引用
收藏
页码:3639 / 3645
页数:7
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