P. Palmieri, A. O. Mitrushenkov, R. Tarroni and T. Thorsteinsson.
J. Chem. Soc. Faraday Trans. 94, 3061-3066 (1998).

Abstract

The fine structure of the A²Pi_u(v=1,2) <- X²Sigma⁺_g(v=0) vibronic transitions of Si₂^– is evaluated theoretically by MRCI computations of the potential energy curves and spin-orbit interactions for the two electronic states. The fine structure components of the two transitions are then compared to the experimental frequencies after corrections for size-consistency and spin-orbit matrix elements.