ROTATING FRAME PULSED NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY

摘要

An NMR method and apparatus for analyzing a sample of interest applies a static magnetic field together with RF pulses of oscillating magnetic field across a sample volume that encompasses the sample of interest. The RF pulses are defined by a pulse sequence that includes a plurality of measurement segments configured to characterize a plurality of relaxation parameters related to relaxation of nuclear magnetization of the sample of interest. Signals induced by the RF pulses are detected in order to derive the relaxation parameters. The measurement segments of the pulse sequence include at least one first-type measurement segment configured to characterize relaxation of spin-lattice interaction between nuclei of the sample of interest in a rotating frame (T1ρ) at a predefined frequency. The T1ρ parameter can be measured in conjunction with the measurement of other relaxation and/or diffusion parameters as part of multidimensional NMR experiments.

主权项

1. A method for analyzing a sample of interest comprising:
(a) while applying at least a static magnetic field across a sample volume that encompasses the sample of interest, applying radio-frequency pulses of oscillating magnetic field across the sample volume, wherein the radio-frequency pulses are characterized by a component in a plane transverse to the static magnetic field, and wherein the pulses are defined by a pulse sequence that includes a plurality of measurement segments that are configured to characterize a plurality of relaxation parameters related to relaxation of nuclear magnetization of the sample of interest; and (b) detecting signals induced by the radio-frequency pulses of oscillating magnetic field produced in (a) in order to derive the plurality of relaxation parameters; wherein the plurality of measurement segments include at least one first-type measurement segment and at least one second-type measurement segment, the first-type measurement segment configured to characterize relaxation of spin-lattice interaction between nuclei of the sample of interest in a rotating frame at a predefined frequency, and the second-type measurement segment configured to characterize at least one other property of the sample of interest, the at least one other property of the sample of interest selected from the group including a relaxation property of the sample of interest in a laboratory frame and a diffusion property of the sample of interest.