RELATIVISTIC MULTICHANNEL THEORY - DOUBLY-EXCITED STATES OF ATOMIC HELIUM

In the report, the recently developed relativistic multichannel theory (RMCT) is a full relativistic non-perturbative method and can be appl ied to the high-Z atomic ions which have given rise to some recent int erests because of researches of inertial confinement fusion and x-ray laser. Based on the RMCT, the positions and widths of doubly excited s p2n(+), sp2n(-), and 2pnd P-1(1) resonances are calculated, which are in agreement with the recent experimental measurements. It sets up a s ound foundation on which the RMCT should be applicable to high Z atomi c ions.