Title: NMR pulse technique with high sensitivity for slowly relaxing systems
Abstract: A pulse technique is described to detect very weak NMR signals with relaxation times T1 and T2 long compared with the decay time T2∗ of the free induction signal after an rf pulse. The technique uses the steady-state free precession between periodic pulses spaced by T ⪡ T1, T2. To avoid a dependence of the signal amplitude on the resonance frequency, i.e., to record undistorted spectra, four measurements with different irradiation frequencies are necessary. Either maximum signal/noise ratio or optimum resolution can be achieved by suitable choice of the ratio TT2∗. Neither accurate adjustment of the pulse length nor equipment in addition to that of a normal Fourier spectrometer are necessary.
Publication Year: 1971
Publication Date: 1971-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 67
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