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Method for NMR spectroscopy with sustained induction decays of long-lived coherences
Method for NMR spectroscopy with sustained induction decays of long-lived coherences
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机译:具有长相干的持续感应衰减的NMR光谱方法
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摘要
A Method for nuclear magnetic resonance (NMR) spectroscopy of a sample comprising the following steps:(a) excitation of long lived coherences (LLC) between the singlet state So and the central triplet state To of nuclei of the sample by initiating irradiation of the sample with an rf-field with carrier frequency ωrf;(b) sustaining of the LLC by maintaining the rf-irradiation during an interval τ2(c) converting the LLC temporarily into observable magnetisation by interrupting the rf-irradiation during an observation interval τ3;(d) detecting NMR-signals during the observation interval τ3;is characterized in that(e) the observable magnetisation is reconverted back into LLC after the observation interval τ3 ;andsteps (b) - (e) are repeated n times, with n is a positive integer.;The method according to the invention allows obtaining ultra high-resolution spectra of long-lived coherences.
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