Circular dichroism of optically active isotropic media of chiral molecules Im(n+−n−)/Im(n++n−) falls off as &ohgr;−2at frequenciesRy≪&ohgr;≪Z2Ryand as &ohgr;−3at &ohgr;≫Z2Ry, whereZis a typical nuclear charge of atoms in the chiral group. The contribution of the spin of electron to the circular dichroism appears in the second order in spin‐orbit perturbation only. The polarization of photoelectrons in the absorption of unpolarized light is connected with the chirality of molecule and constitutesZ2&agr;3from the degree of geometrical asymmetry. ©1996 American Institute of Physics.