径向射频场对MAS光谱的影响

Maurice Goldman , Piotr Tekely
{"title":"径向射频场对MAS光谱的影响","authors":"Maurice Goldman ,&nbsp;Piotr Tekely","doi":"10.1016/S1387-1609(01)01310-X","DOIUrl":null,"url":null,"abstract":"<div><p>When, in the method MAS, part of the sample is at the edge of the coil so as to experience a partly radial RF field, this part gives rise during the sample spinning to spectra shifted by –1 and +1 times the spinning frequency, which are superimposed on the normal spectra with possible sidebands due to the modulated interactions, anisotropic chemical shifts and dipolar or quadrupolar interactions. The amplitude of these shifted spectra depends on the RF field distribution over the sample and on the amplitude of the RF pulse preceding the observation of the FID. On the other hand, it is independent of the spinning frequency. The quantitative description of this effect necessitates the use of the Reciprocity Theorem. Following a simplified account of the relevant theory, experimental illustrations of this effect are presented. The analysis of these contributions to the amplitudes of the sidebands makes it possible to determine the conditions under which the perturbation of the spectra is negligible.</p></div>","PeriodicalId":100305,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry","volume":"4 11","pages":"Pages 795-800"},"PeriodicalIF":0.0000,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1387-1609(01)01310-X","citationCount":"4","resultStr":"{\"title\":\"Effect of radial RF field on MAS spectra\",\"authors\":\"Maurice Goldman ,&nbsp;Piotr Tekely\",\"doi\":\"10.1016/S1387-1609(01)01310-X\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>When, in the method MAS, part of the sample is at the edge of the coil so as to experience a partly radial RF field, this part gives rise during the sample spinning to spectra shifted by –1 and +1 times the spinning frequency, which are superimposed on the normal spectra with possible sidebands due to the modulated interactions, anisotropic chemical shifts and dipolar or quadrupolar interactions. The amplitude of these shifted spectra depends on the RF field distribution over the sample and on the amplitude of the RF pulse preceding the observation of the FID. On the other hand, it is independent of the spinning frequency. The quantitative description of this effect necessitates the use of the Reciprocity Theorem. Following a simplified account of the relevant theory, experimental illustrations of this effect are presented. The analysis of these contributions to the amplitudes of the sidebands makes it possible to determine the conditions under which the perturbation of the spectra is negligible.</p></div>\",\"PeriodicalId\":100305,\"journal\":{\"name\":\"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry\",\"volume\":\"4 11\",\"pages\":\"Pages 795-800\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2001-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1387-1609(01)01310-X\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S138716090101310X\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S138716090101310X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4

摘要

在MAS方法中,当部分样品处于线圈边缘,从而经历部分径向的射频场时,这部分样品在自旋过程中产生自旋频率位移-1和+1倍的光谱,这些光谱由于调制相互作用、各向异性化学位移和偶极或四极相互作用而叠加在具有可能的边带的正常光谱上。这些位移光谱的幅度取决于样品上的射频场分布和FID观察之前的射频脉冲幅度。另一方面,它与旋转频率无关。这种效应的定量描述需要使用互易定理。在对相关理论进行简化说明后,给出了这种效应的实验实例。分析这些对边带振幅的贡献,可以确定谱的摄动可以忽略不计的条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of radial RF field on MAS spectra

When, in the method MAS, part of the sample is at the edge of the coil so as to experience a partly radial RF field, this part gives rise during the sample spinning to spectra shifted by –1 and +1 times the spinning frequency, which are superimposed on the normal spectra with possible sidebands due to the modulated interactions, anisotropic chemical shifts and dipolar or quadrupolar interactions. The amplitude of these shifted spectra depends on the RF field distribution over the sample and on the amplitude of the RF pulse preceding the observation of the FID. On the other hand, it is independent of the spinning frequency. The quantitative description of this effect necessitates the use of the Reciprocity Theorem. Following a simplified account of the relevant theory, experimental illustrations of this effect are presented. The analysis of these contributions to the amplitudes of the sidebands makes it possible to determine the conditions under which the perturbation of the spectra is negligible.

求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信