A simple and fast method is introduced which eliminates the effects of a distribution of chemical shifts in NMR imaging. When the gradient-induced shift is not much larger than the distribution of chemical shifts, distortions are observed which smear the image and degrade the resolution. To ...
19F NMR, Applications, Solution State Claudio Pettinari, Giovanni Rafaiani, in Encyclopedia of Spectroscopy and Spectrometry, 1999 Chemical shift Fluorine chemical shifts cover a very large range (more than 1300 ppm, about two orders greater than 1H chemical shift) when organic, inorganic, and organ...
chemical shift化学位移核磁共振氢谱-回复 Chemical shift, also known as the nuclear magnetic resonance (NMR) proton spectrum, is a fundamental technique used in chemistry to determine the chemical environment of hydrogen atoms in a molecule. In this article, we willexplore the concept of chemical ...
NMR chemical shift in PbTe and spin-orbit effects The observed large NMR chemical shift of Pb in PbTe is explained, within the framework of a k.π method, mainly through a contribution attributed to the sp... RL Hota,RC Patnaik,GS Tripathi,... - 《Phys Rev B Condens Matter》 被引量...
The NMR chemical shift method was applied for the determination of the magnetic susceptibility of paramagnetic transition metal complexes in solution. The method was found to be very useful for the determination of magnetic susceptibility changes during a chemical reaction in which one paramagnetic compou...
Chemical shift imaging combines the spatial information provided by a conventional nuclear magnetic resonance (NMR) image with the chemical shift spectral information provided by NMR spectroscopy. In order to preserve the chemical shift information and provide a spatial map simultaneously, new NMR imaging...
由deshield就导出chemical shift向左移? 相关知识点: 试题来源: 解析 以H-NMR来说明 在外加磁场下 氢原子核的自旋有两种状态1/2和-1/2 当照射能量时 低能阶的自旋态会转成高能阶的状态 以吸收的能量作图 就可以得到吸收峰值 对于氢原子核来说 磁场会受到外围电子云的影响 电子云密度高 会遮蔽磁场 shield ...
Chemical shift ranges in carbon‐13 NMR spectroscopy. Verlag Chemie Weinheim 1982, 900 S. Preis: 220 DM Wolfgang Bremser, Burghard Franke, Hans Wagner. Chemical shift ranges in carbon‐13 NMR spectroscopy. Verlag Chemie Weinheim 1982, 900 S. Preis: 220 DM.doi:10.1002/crat.2170181119H. ...
aHowever, the chemical shift variability of 1H NMR signals, which is due to differences in pH and ionic strength among urine samples, remains an outstanding problem for efficient data mining. 正在翻译,请等待...[translate]
In particular, it has been found that the 1H NMR chemical shift of the alpha-CH proton of all 20 naturally occurring amino acids experiences an upfield shift (with respect to the random coil value) when in a helical configuration and a comparable downfield shift when in a beta-strand ...