THEORETICAL-STUDY OF THE A(1)PI-X-1-SIGMA(-1-SIGMA(+)-X-1-SIGMA(+) BANDS OF SIO() AND E)

Franck-Condon factors and radiative lifetimes of the A(1) pi-X-1 Sigma (+) and E-1 Sigma(+)- X-1 Sigma(+) transitions of the SiO-molecule hav e been calculated from accurate ab initio MRCI calculations including electronic transition moment variations. A comparison of the present r esults with the RKR potentials shows a good agreement and the deduced spectroscopic constants agree reasonably well with the experimental va lues. The variations of the electronic transition moment of the two ba nds are compared with the few experimental data and critically discuss ed. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.