CIRCULAR-DICHROISM IN THE DOUBLE PHOTOIONIZATION OF MOLECULES

The existence of circular dichroism in the triple differential cross s ection is shown for the emission of two electrons in the one-step doub le photoionization of a molecule. Our study reveals that the geometric al requirements for the presence of dichroic effects in the double pho toionization of linear molecules are identical to those for atoms. But there are, in general, no restrictions for the presence of dichroism in non-linear molecules because it may now exist for two photoelectron s observed even with equal energies in any of the physically feasible experimental geometries. For illustration, a general procedure for stu dying dichroism in the double photoionization from the a(1) orbital of a T-d molecule is discussed.