SPIN UP-DOWN ASYMMETRY IN CORRELATION BETWEEN PHOTOELECTRONS AND AUGER ELECTRONS FROM ATOMS AND ROTATING LINEAR-MOLECULES

In this paper, we have studied spin up-down asymmetry between photoele ctrons and Auger electrons emitted sequentially from an atomic or a ro tating linear molecular target. In the absence of all spin-dependent i nteractions in the whole system, this asymmetry becomes exactly equal to the measured average value of the spin correlation observable; but differs otherwise. Even in the former case, the quantum mechanical exp ectation value of this observable, obtained according to the models of Kammerling and Schmidt and Bohm in the common singlet spin state of t wo outgoing electrons, was shown to be different from and a special ca se of the general result derived here. We have calculated in LS-coupli ng as well as in jj-coupling the spin up down asymmetry between photoe lectrons emitted in 4d(5/2) ionization of Xe and the subsequent N-5-O2 3O23 S-1(0) Auger electrons. The spin-orbit interaction in this exampl e is found to be least effective for linearly polarized incident light but has a maximum influence when the absorbed photon is unpolarized o r circularly polarized.