“…The interactions between the nuclei and the light, which are mediated by the electron cloud of the molecule, have shown promise for opening new types of spectroscopic measurements, such as observation of dipolar couplings in isotropic liquids 26 or mapping the properties of excited states. 23 So far, five NMOS effects have been described: nuclear spininduced optical rotation (NSOR), [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] nuclear spin-induced circular dichroism (NSCD), [19][20][21][22][23] nuclear spin-induced Cotton-Mouton effect (NSCM), 24,25 nuclear spin-induced Cotton-Mouton effect in an external magnetic field (NSCM-B), 26,27 and nuclear quadrupole-induced Cotton-Mouton effect (NQCM). 28,29 Out of these, only NSOR, a circular birefringence caused by nuclear magnetic moments oriented along the light beam, has been experimentally measured so far.…”