IMPROVED L(2)-STABILIZATION THEORY TO COMPUTE RESONANCES UNDER MULTICHANNEL CONDITIONS

The stabilization theory for the calculation of resonance energies and widths in the version of Mandelshtam, Taylor, Ryaboy and Moiseyev has been applied to collinear ABA molecules in which two Morse potentials are kinetically coupled. This system has about 40 resonances in 10 ch annels. The results are compared with converged computations by the co mplex scaling method. Subtracting the background phase of the uncouple d problem (but including the full potential) improves the stabilizatio n calculation appreciably, allowing easier identification of the reson ances and better fits of the scattering phase to the arctan-sigmoids, from which the resonance position in the complex plane can be computed .