US 5,099,206 A · Nuclear magnetic resonance spectroscopy

Abstract

There is disclosed high-resolution NMR spectroscopy in solids. Magic angle spinning and cross polarization are used in conjunction. The sample is rotated by a spinner at a high speed about an axis oriented at the magic angle 54.degree.44' with respect to the static magnetic field. Under this condition, a 90.degree. pulse is applied to abundant nuclear species, such as .sup.1 H that is coupled to dilute nuclear species, such as .sup.13 C. Then, a spin-locking pulse or pulse sequence is applied to the abundant nuclear species. An observing pulse or pulse sequence is applied to the dilute nuclear species. The free induction decay signal from the dilute nuclear species is detected. The spin-locking pulse or the observing pulse is amplitude-modulated at a low frequency.

Claims6

Dependent claims

Nuclear magnetic resonance spectroscopy comprising the steps of:

rotating a sample at a high speed about an axis oriented at the magic angle with respect to a static magnetic field;
simultaneously applying a 90.degree. pulse to an unobserved nuclear species coupled to a nuclear species to be observed and then applying a spin-locking pulse or pulse sequence to the unobserved nuclear species;
applying an observing pulse or pulse sequence to the observed nuclear species;
detecting the resonant signal emanating from the observed nuclear species;
and wherein at least one of the time-average amplitude of the spin-locking pulse or pulse sequence during the period of the pulse or pulse sequence and the time-average amplitude of the observing pulse or pulse sequence during the period of the pulse or pulse sequence is varied.

2 more elements

Dependencies are inferred from the claim text.

Nuclear magnetic resonance spectroscopy

Life of this patent

Nuclear magnetic resonance spectroscopy

Life of this patent

Abstract

Claims6