CORRELATED RELATIVISTIC CALCULATION OF THE GIANT-RESONANCE IN THE GD3-SPECTRUM( ABSORPTION)

The aim of the present study is to extend the multiconfiguration Dirac -Fock approach to include spin polarization in order to study magnetic ally ordered systems. Routines handling time-dependent ionization phen omena adapted to multilevel and multichannel autoionization processes have been developed and used to describe the giant resonance in the Gd 3+ absorption spectrum. in our calculation of the complete energy stru cture of 4d(9)4f(8) configuration it is discovered that the majority o f the oscillator strength associated with the 4d-4f transitions is lim ited to a relatively narrow spectral width, creating a giant resonance . Our calculations take account of the most important correlation effe cts, and the agreement with the experimentally observed giant resonanc e in gadolinium is quite good. (C) 1997 John Wiley & Sons, Inc.