PHOTOIONIZATION CROSS-SECTION CALCULATIONS OF HCL BY THE STIELTJES TECHNIQUE - EFFECT OF THE CHANNEL COUPLING

Partial and total valence- and inner-shell photoionization cross sections of HCl are calculated in the random phase approximation employing an extended basis set and the Stieltjes imaging procedure. Results of independent-channel as well as multi-channel calculations in the static-exchange approximation are reported for comparison. The generally good agreement with recent experimental measurements indicates that the random phase approximation provides an efficient description of photoionization channel coupling. The calculated vertical spectra in the 'discrete' region of valence- and inner-shell are also reported.