JAHN-TELLER EFFECT IN ZNS-FE2- A COMPARISON BETWEEN THE METHOD OF GLAUBER STATES AND BORN-OPPENHEIMER STATES( )

The absorption spectra of magnetic impurities in II-VI compounds can o nly be explained if the Jahn-Teller effect is taken into account. To c ope with this task there is a variaty of methods. In the present work we compare two of them. Born-Oppenheimer method and Glauber states met hod. The application makes use of the parameters that would be appropr iate for the absorption spectrum of ZnS:Fe2+. The only free parameter in our calculations is the Jahn-Teller energy, so we do not attempt he re a final description of the spectrum. The emphasis is on the compari son of both methods looking for their validity and divergence conditio ns and especially the way in which they can reinforce each other to gi ve a more reliable description of these spectra.