GEOMETRIES OF THIOBORINE AND CHLOROTHIOBORON CATIONS

The ionic geometries of thioborine HBS+ and chlorothioboron CIBS+ cati ons were deduced by applying Franck-Condon analyses to the correspondi ng He(I) photoelectron bands. The BH and BS bond lengths and the rotat ional constants of HBS+ were respectively found to be 1.197 Angstrom, 1.715 Angstrom and 0.5603 cm(-1) in the X(2) pi state and 1.185 Angstr om, 1.639 Angstrom and 0.6089 cm(-1) in the A(2) Sigma(+) state. As fo r the CIBS+ ion, the BCl and BS bond distances and the rotational cons tant have values of 1.590 Angstrom, 1.716 Angstrom and 0.0923 cm(-1) r espectively. The calculated structural parameters are compared with th ose from experimental work and ab initio calculations. In addition, th e force constants of the two cations have also been determined.