Patent ID: 8362770

Claim:
A method for nuclear magnetic resonance (NMR) spectroscopy of a sample with which the sample is prepared and an NMR spectroscopy measurement is carried out, the method comprising the steps of: a) transforming a thermal equilibrium Boltzmann distribution (I z +S z ) into a difference (I z −S z ); b) flipping the difference (I z −S z ) to a transverse plane; c) irradiating the sample with an rf-field to effect, in combination with steps a) and b), excitation of long lived coherences (LLC) between a singlet state S 0 and a central triplet state T 0 of nuclei of the sample; d) sustaining the LLC by maintaining rf-irradiation during an interval t 1 ; and e) converting the LLC into observable magnetisation by interrupting the rf-irradiation.