Patent ID: 8633697

Claim:
A method for nuclear magnetic resonance (NMR) spectroscopy of a sample, the method comprising the steps of: a) exciting long lived coherences (LLC) between a singlet state S 0 and a central triplet state T 0 of nuclei of the sample by irradiating the sample with an rf-field having a carrier frequency ω rf ; b) sustaining the LLC by maintaining rf-irradiation during an interval τ 2 ; c) temporarily converting the LLC into observable magnetisation by interrupting the rf-irradiation during an observation interval τ 3 ; d) detecting NMR-signals during the observation interval τ 3 ; e) reconverting the observable magnetisation back into LLC after the observation interval τ 3 ; and f) repeating steps (b) to (e) n times, wherein n is a positive integer.