Effects of Finite Rf Pulses and Sample Spinning Speed in Multiple-Quantum Magic-Angle Spinning (MQ-MAS) and Multiple-Quantum Quadrupolar Carr-Purcell-Meiboom-Gill Magic-Angle Spinning (MQ-QCPMG-MAS) Nuclear Magnetic Resonance of Half-Integer Quadrupo

Flemming H. Larsen; Niels Chr. Nielsen

首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Effects of Finite Rf Pulses and Sample Spinning Speed in Multiple-Quantum Magic-Angle Spinning (MQ-MAS) and Multiple-Quantum Quadrupolar Carr-Purcell-Meiboom-Gill Magic-Angle Spinning (MQ-QCPMG-MAS) Nuclear Magnetic Resonance of Half-Integer Quadrupo

【24h】

Effects of Finite Rf Pulses and Sample Spinning Speed in Multiple-Quantum Magic-Angle Spinning (MQ-MAS) and Multiple-Quantum Quadrupolar Carr-Purcell-Meiboom-Gill Magic-Angle Spinning (MQ-QCPMG-MAS) Nuclear Magnetic Resonance of Half-Integer Quadrupo

机译：有限Rf脉冲和样品旋转速度在多量子幻角自旋（MQ-MAS）和多量子四极Carr-Purcell-Meiboom-Gill幻角自旋（MQ-QCPMG-MAS）核磁共振中的影响-整数Quadrupo

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相似文献
相关主题

摘要

The multiple-quantum magic-angle spinning (MQ-MAS) solid-state nuclear magnetic resonance (NMR) experiment and a sensitivity-enhanced variant detecting the second-order quadrupolar powder pattern through a train of quadrupolar Carr-Purcell-Meiboom-Gill refocusing pulses (MQ-QCPMG-MAS) are analyzed with respect to the effects of finite radio frequency (rf) pulse irradiation and the MAS frequency. Taking these effects explicitly into account, it is possible to accurately determine optimum conditions for excitation of MQ coherences and reconversion of these into detectable single-quantum coherences as well as simulate the second-order quadrupolar lineshape necessary to extract accurate parameters for quadrupolar coupling interactions and isotropic chemical shifts. This accurate determination is of great importance for the exploitation of MQ-MAS and MQ-QCPMG-MAS NMR experiments for quantitative determination of site populations. The various effects are described analytically and demonstrated by numerical simulations and by ~(87)Rb MQ-MAS and MQ-QCPMG-MAS experiments on RbNO_3.

机译：多量子魔术角旋转（MQ-MAS）固态核磁共振（NMR）实验和灵敏度增强型变量，通过一系列四极Carr-Purcell-Meiboom-Gill重聚焦来检测二阶四极粉末图案针对有限射频（rf）脉冲辐照和MAS频率的影响分析了脉冲（MQ-QCPMG-MAS）。明确考虑到这些影响，可以准确确定激发MQ相干并将其重新转换为可检测的单量子相干的最佳条件，并模拟为提取四极耦合相互作用的准确参数所必需的二阶四极线形。各向同性的化学位移。这种准确的确定对于利用MQ-MAS和MQ-QCPMG-MAS NMR实验定量确定位点种群非常重要。分析地描述了各种影响，并通过数值模拟以及RbNO_3上的〜（87）Rb MQ-MAS和MQ-QCPMG-MAS实验进行了证明。

著录项

来源
《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |1999年第50期|共8页
作者
Flemming H. Larsen; Niels Chr. Nielsen;
展开▼
作者单位

展开▼
收录信息
原文格式 PDF
正文语种 eng
中图分类物理化学（理论化学）、化学物理学;
关键词

相似文献

外文文献
中文文献
专利

1. Effects of Finite Rf Pulses and Sample Spinning Speed in Multiple-Quantum Magic-Angle Spinning (MQ-MAS) and Multiple-Quantum Quadrupolar Carr-Purcell-Meiboom-Gill Magic-Angle Spinning (MQ-QCPMG-MAS) Nuclear Magnetic Resonance of Half-Integer Quadrupo [J] . Flemming H. Larsen, Niels Chr. Nielsen The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory . 1999,第50期

机译：有限Rf脉冲和样品旋转速度在多量子幻角自旋（MQ-MAS）和多量子四极Carr-Purcell-Meiboom-Gill幻角自旋（MQ-QCPMG-MAS）核磁共振中的影响-整数Quadrupo
2. Characterization of Mo-P-Alumina Sol-Gel Catalysts by Solid-State ↑(31)p and↑(27)A1 Magic-Angle Spinning Nuclear Magnetic Resonance and Two-Dimensional↑(27)A1 Multiple-Quantum Magic-Angle Spinning Nuclear Magnetic Resonance [J] . R. Iwamoto, C. Fernandez, J. P. Amoureux The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 1998,第21a24期

机译：固态↑（31）p和↑（27）A1幻角自旋核磁共振和二维↑（27）A1多量子幻角自旋核对Mo-P-氧化铝溶胶-凝胶催化剂的表征磁共振
3. Multiple-quantum magic-angle spinning:high-resolution and solid state NMR spectroscopy of half-integer quadrupolar nuclei [J] . Amir Goldbourt, Perunthiruthy K.Madhu Monatshefte fur Chemie . 2002,第12期

机译：多量子幻角旋转：半整数四极核的高分辨率和固态NMR光谱
4. Identifying and Quantifying Actinide Radiation Damage in Ceramics with Radiological Magic-Angle Spinning Nuclear Magnetic Resonance [C] . Ian Farnan, Herman Cho, William J. Weber Materials Research Society Symposium . 2007

机译：用放射魔法角旋转核磁共振识别和定量陶瓷陶瓷辐射损伤
5. APPLICATIONS OF PULSED NUCLEAR MAGNETIC RESONANCE TO CHEMISTRY: MULTIPLE-PULSE NMR, CROSS POLARIZATION, MAGIC-ANGLE SPINNING AND INSTRUMENTAL DESIGN. [D] . MURPHY, PAUL DUBOIS. 1979

机译：脉冲核磁共振在化学中的应用：多脉冲NMR，交叉极化，磁角旋转和仪器设计。
6. Varied magnetic field multiple-pulse and magic-angle spinning proton nuclear magnetic resonance study of muscle water. [O] . B M Fung, L M Ryan, B C Gerstein 1980

机译：肌肉水的可变磁场多脉冲和魔角旋转质子核磁共振研究。
7. Improved Excitation Schemes for Multiple-Quantum Magic-Angle Spinning for Quadrupolar Nuclei Designed Using Optimal Control Theory [O] . -1

机译：改进了使用最优控制理论设计的四量子魔法角旋转的励磁方案
8. Applications of Pulsed Nuclear Magnetic Resonance to Chemistry: Multiple-Pulse NMR, Cross Polarization, Magic-Angle Spinning Annd Instrumental Design [R] . Murphy, P. D. 1979

机译：脉冲核磁共振在化学中的应用：多脉冲核磁共振，交叉极化，魔角旋转和仪器设计

Effects of Finite Rf Pulses and Sample Spinning Speed in Multiple-Quantum Magic-Angle Spinning (MQ-MAS) and Multiple-Quantum Quadrupolar Carr-Purcell-Meiboom-Gill Magic-Angle Spinning (MQ-QCPMG-MAS) Nuclear Magnetic Resonance of Half-Integer Quadrupo

摘要

著录项

相似文献

相关主题

期刊订阅