Restraints on bi-exponential fitting of inversion-recovery data involved in two-site exchange
文献类型：期刊论文
| 作者 | Mao, XA; Zhang, YH |
| 刊名 | CONCEPTS IN MAGNETIC RESONANCE
 |
| 出版日期 | 2001 |
| 卷号 | 13期号:5页码:326-333 |
| 关键词 | inversion-recovery relaxation data fitting bi-exponential restraints approximation to mono-exponential |
| 英文摘要 | The recovery of the inverted magnetization in two-site exchange systems generally follows a bi-exponential law, C(+)e (-lambda +t) + C(-)e (-lambda -t) with lambda (+)> lambda (-). With the assumption R-1A < R-1B (R-1 denotes the relaxation rate), however, bi-exponential fitting should be performed under the restraints: one of the four coefficients in the AB system, CA+, Must be positive, while the other three, CA- CB+, and CB-, must be negative. The bi-exponential law can be approximated to a mono-exponential law only when one of the following conditions is satisfied. (1) k(AB) + k(BA) much less than \R-1A - R-1B\ (slow exchange limit); (2) k(AB) + k(BA) much greater than \R-1A - R-1B\ (fast exchange limit); (3) k(AB) + k(BA) can be any value, but R-1A approximate to R-1B (small relaxation-difference limit); (4) P-A much greater than P-B (large population-difference limit), where k and P denote the exchange rate and population, respectively. The last condition is suitable only to the more populated spin. (C) 2001 John Wiley & Sons, Inc. |
| WOS标题词 | Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine ; Technology |
| 类目[WOS] | Chemistry, Physical ; Physics, Atomic, Molecular & Chemical ; Radiology, Nuclear Medicine & Medical Imaging ; Spectroscopy |
| 研究领域[WOS] | Chemistry ; Physics ; Radiology, Nuclear Medicine & Medical Imaging ; Spectroscopy |
| 关键词[WOS] | CHEMICAL-EXCHANGE ; RELAXATION-TIMES ; SYSTEMS ; NA-23 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000171110100003 |
| 公开日期 | 2015-12-08 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/8612]  |
| 专题 | 武汉物理与数学研究所_2011年以前论文发表（包括2011年） |
| 作者单位 | Chinese Acad Sci, Wuhan Inst Phys & Math, Lab Magnet Resonance & Atom Mol Phys, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mao, XA,Zhang, YH. Restraints on bi-exponential fitting of inversion-recovery data involved in two-site exchange[J]. CONCEPTS IN MAGNETIC RESONANCE,2001,13(5):326-333. |
| APA | Mao, XA,&Zhang, YH.(2001).Restraints on bi-exponential fitting of inversion-recovery data involved in two-site exchange.CONCEPTS IN MAGNETIC RESONANCE,13(5),326-333. |
| MLA | Mao, XA,et al."Restraints on bi-exponential fitting of inversion-recovery data involved in two-site exchange".CONCEPTS IN MAGNETIC RESONANCE 13.5(2001):326-333. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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