Abstract
The theory of optical NMR and ESR is developed for site selective investigation of complex systems in solution, such as folded proteins. Optical NMR and ESR is based on the ability of a circularly polarized visible frequency laser to give up the angular momentum of its photons to electrons of the sample, thus creating a magnetic moment whose magnitude is the Bohr magneton per photon. This effect is accompanied by other mechanisms of angular momentum transfer, such as the inverse Faraday effect. The magnetic dipole moment produced by the photon interacts with the strong static magnetic field of the NMR or ESR instrument, giving site selective resonances which can be mapped using conventional 2D and enhancement techniques.
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