Abstract
Single-molecule magnetic resonance spectroscopy and imaging is one of the ultimate goals in magnetic resonance and will has great applications in a broad range of scientific areas, from life science to physics and chemistry. To achieve this goal, the spin of a single nitrogen vacancy (NV) center in diamond is proposed as a highly sensitive magnetic-field sensor. Our research keeps on the line from one-dimension spectroscopy to two-dimension spectroscopy at single molecule scale. We and co-workers have successfully done a series of work on one-dimension spectroscopy [1-4]. However, measurement of the magnetic dipole-dipole couplings of a molecule is a missing key step from one-dimension to two-dimension magnetic resonance spectroscopy at nanoscale. Through correlation methods, we succeed to detect the intra-molecule magnetic dipole interaction of (5 nanometer)3 volume samples. In the future, magnetic coupling of a single molecule could be achieved if the coherence property of shallow NV sensor is improved [5].
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