Method for recording spin resonance spectra
US5166616A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 12, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Feb 12, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/4833
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method serving for recording spin resonance spectra of test samples having at least two groups (CH.sub.3, CH) of nuclei of the same kind and of substantially identical chemical shift, comprises the step of suppressing the signal of the second group (CH) for the purpose of obtaining an isolated image of the signal of the first group (CH.sub.3). To this end, a pulse sequence of four r.f. pulses, preferably 90.degree. r.f. pulses (10, 12, 13, 14), are irradiated upon the sample. The first r.f. pulse (10) is a soft pulse, selective for the nuclei of the first group (CH.sub.3). The second r.f. pulse (12) is a soft pulse, selective for the nuclei of the second group (CH), and causes the magnetizations of the nuclei of the first group (CH.sub.3) and of the second group (CH) to be transferred, at least in part, to a state of multiple-quantum coherence. Immediately following the second r.f. pulse (12) the third r.f. pulse (13), being at least one hard pulse, is irradiated upon the sample, and is adjusted in such a way that the multiple-quantum coherence is transferred to a correlated z-order state. A dephased magnetic gradient field pulse (15) is exerted upon the sample (30) in the interv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.