NEW RESONANCES IN A DYNAMIC POLARIZABILITY CALCULATION

Application of the time-dependent coupled Hartree-Fock theory of many- electron systems like the ions in the argon isoelectronic sequence rev eals the occurrence of a new resonance, hitherto unreported in the lit erature. This resonance is observed from K+ onwards and falls within t he normal dispersion region for the isoelectronic ions having Z greate r-than-or-equal-to 20 and is believed to be due to the dynamic correla tions present in such systems. In the neighbourhood of this resonance dynamic polarizability values exhibit complex structure. The oscillato r strength associated with the transition is found to be low.