Uniform chemical shift scaling: Application to 2Dresolved NMR spectra of rotating powdered samples
| Autor: | Robert G. Griffin, W. P. Aue, D.J Ruben |
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| Rok vydání: | 1984 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 80:1729-1738 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.446928 |
| Popis: | Chemical shift scaling experiments which reduce the number and intensity of sidebands in high field magic angle sample spinning (MASS) spectra are described. They rely on the fact that the scaling pulse sequence reduces the effective size of the shift anisotropy, so that moderate speed spinning results in spectra devoid of sidebands of appreciable amplitude. In principle, the technique allows a realization of the full signal strength available in high field MASS spectra. In addition a number of other interesting features have emerged from the experiments. First, the problem of decoupling in the presence of a scaling sequence has been solved by arranging the rf field strengths to mismatch the Hartmann–Hahn condition. Second, it is shown that the scaling cycles used in the experiments are uniform over a wide frequency range with respect to both the scaling factor and the linewidth. Third, under certain conditions, the frequencies for scaling and spinning are about the same size and consequently new features... |
| Databáze: | OpenAIRE |
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