Amplitude modulation and relaxation due to diffusion in NMR experiments with a rotating sample

被引：17

作者：

Leu, G

Tang, XW

Peled, S

Maas, WE

Singer, S

Cory, DG

Sen, PN ^{[1
]}

机构：

[1] MIT, Dept Nucl Engn, Cambridge, MA 02139 USA

[2] Tel Aviv Sourasky Med Ctr, Dept Radiol, Tel Aviv, Israel

[3] Bruker Instruments Inc, Billerica, MA 01821 USA

[4] Harvard Univ, Brigham & Womens Hosp, Sch Med, Boston, MA 02215 USA

[5] Schlumberger Doll Res Ctr, Ridgefield, CT 06877 USA

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 332卷 / 3-4期

基金：

美国国家卫生研究院;

关键词：

D O I：

10.1016/S0009-2614(00)01273-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The simultaneous effects of diffusion and coherent averaging by magic angle sample spinning (MASS) are investigated both theoretically and experimentally for spins diffusing in a spatially varying susceptibility field. The diffusion introduces a periodic modulation and a relaxation of the magnetization amplitude. The attenuation exponent for the nth echo at an early time is given by D(0)gamma (2)g(2)pin(4 omega (3)(r)), where omega (r) is the rotor frequency, D-0 the diffusion coefficient, gamma is the gyromagnetic factor, and a factor g(2) which is related to, but different from, the volume average of the gradient squared. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：344 / 350

页数：7

共 31 条

[1] NUCLEAR MAGNETIC RESONANCE SPECTRA FROM A CRYSTAL ROTATED AT HIGH SPEED [J].