MULTIPLET EFFECTS IN NEAR EDGE XAS FOR GROUND STATE STUDIES

Manifold aspects of high resolution near edge absorption spectroscopy in the soft X-ray range can reveal interesting information on the nature of the ground state in various materials. One method uses the near edge multiplet structure of the final states, in which the optical selection rules limit the terms that can be reached from a given ground state. Thus the observed multiplet can be used to diagnose the ground state. This will be illustrated for Ce impurities and for Ni compound