Observation of optical chemical shift by precision nuclear spin optical   rotation measurements and calculations
  Nuclear spin optical rotation (NSOR) is a recently developed technique for detection of nuclear magnetic resonance via rotation of light polarization, instead of the usual long-range magnetic fields. NSOR signals depend on hyperfine interactions with virtual optical excitations, giving new information about the nuclear chemical environment. We use a multi-pass optical cell to perform first precision measurements of NSOR signals for a range of organic liquids and find clear distinction between proton signals for different compounds, in agreement with our earlier predictions. Detailed first principles quantum-mechanical NSOR calculations are found to be in good agreement with the measurements. 
Junhui Shi, Suvi Ik\"al\"ainen, Juha Vaara, Michael V. Romalis
physics.chem-ph physics.atom-ph