Abstract
In this work we present a sensitiveJ-coupling spectroscopyin one shot using high-Tc superconducting quantum interference devices and a flux transformer in microtesla fields.In the proposed NMR detection scheme the precession of proton spin was inductivelycoupled to the SQUID magnetometer. We enhanced the SNR signal and the spectralresolution significantly by applying a pre-polarization field of 0.045 T. In microtesla fieldswhere chemical shifts are absent, we demonstrate proton–phosphate couplingJ3[H,P] = (10.94 ± 0.08) Hz in trimethyl phosphate. The sensitive NMR spectrometer will be of greatinterest for diagnosis information of molecular structure and biological applications.
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