BOUND-STATE WAVE-FUNCTIONS FROM COUPLED-CHANNEL CALCULATIONS USING LOG-DERIVATIVE PROPAGATORS - APPLICATION TO SPECTROSCOPIC INTENSITIES INAR-HF

A method for obtaining wave functions from coupled-channel bound state calculations using log-derivative propagators is presented. Bound sta tes occur at energies for which the inward and outward log-derivative solutions match at a central point in the propagation; at such energie s, the log-derivative matching matrix has one eigenvalue which is zero . The wave function at the matching point is the eigenvector correspon ding to this zero eigenvalue. The wave function at other points can be obtained by back-substitution in the log-derivative propagation equat ions. The method is tested by calculating infrared intensities for the Ar-HF van der Waals complex, using the H6(4,3,2) potential.