| 摘要 |
The process disclosed is intended for recording the nuclear-resonance spectra of samples with at least three groups of spin. A first group is coupled with a second group, while a third group is decoupled from the second group, but has a spectral position, e.g. a chemical shift, which substantially matches only those of the first group. To display the signal of the first group alone, the signal of the third group is suppressed. Using prior art techniques, a train of three high-frequency pulses (10, 13, 22) is passed through the sample. The second pulse (13) is chosen so that the spin magnetization of the second group is transmitted by polarization transfer to the spins of the second group. The sample is thus subjected to a first gradient magnetic-field pulse (17, 23) which dephases the spins of the second group. The third high-frequency pulse (22) is chosen so that the spin magnetization of the second group is transmitted by polarization back-transfer to the spins of the first group which are finally exposed to a second gradient magnetic-field pulse (23) which brings the spins of the first group (A) back into phase. |
