NMR magnetization inversion by non-linear adiabatic fast passage

Details NMR magnetization inversion by non-linear adiabatic fast passage NMR magnetization inversion by non-linear adiabatic fast passage

Filed on

1985-06-18

Date issued

1987-09-22

Examiner

Noland, Tom

Patent Class

Electricity: measuring and testing

SubClass

Particle precession resonance

SubSubClass

Using a nuclear resonance spectrometer system

Other Related Categories

324313, 324309, 324311, G01R 3320

Type

Patent

Status

active

Patent number

046957995

Description

ABSTRACT:
A method for the complete inversion of magnetization by adiabatic fast passage during an NMR experiment on a sample having a selected nuclear specie with a Larmor frequency .omega..sub.0. A radio-frequency magnetic field is generated with an amplitude B.sub.1 and an instantaneous frequency .omega.(t) which is non-linearly swept, as a function of time, from a minimum frequency .omega..sub.1 substantially at a maximum offset frequency .DELTA..omega. below the Larmor frequency .omega..sub.0, through the Larmor frequency, to a maximum frequency .omega..sub.h substantially at the maximum offset frequency .DELTA..sub..omega. above the Larmor frequency. The non-linearly swept, monotonic RF signal is applied to the sample-being-investigated for a sweep time interval sufficient to invert the magnetization of the selected nuclear specie. The preferred sweep is a tangential function:

REFERENCES:
patent: 3826972 (1974-07-01), Day et al.
patent: 4390840 (1983-06-01), Ganssen et al.
patent: 4565968 (1986-01-01), Macovski
patent: 4577152 (1986-03-01), Macovski
"Broadband Population Inversion by Phase Modulated Pulses", J. Baum et al., J. Chem. Phys. 79(9), 1 Nov. 1983.

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