The selfhyphen;consistenthyphen;field plus configurationhyphen;interaction method has been used to compute potential energy curves and certain onehyphen;electron properties for theX1Sgr;+,C1Sgr;minus;,A1Pgr;, andE1Sgr;+states of SiO. This study employed a basis consisting of 51 Slaterhyphen;type orbitals which is an expanded version of the one reported by McLean and Yoshimine. The computed groundhyphen;state dissociation energy (De) of 8.1 eV is in excellent agreement with the experimental value of 8.26plusmn;0.13 eV. The theoretical groundhyphen;state electric dipole moment function is in good agreement with the experimental curve constructed from the microwave data for thev=0ndash;3 vibrational levels. EinsteinAcoefficients for vibrationndash;rotation transitions computed from existing theoretical and experimental data are in good agreement. TheE1Sgr;+state is shown to dissociate adiabatically to groundhyphen;state atoms over a potential barrier with a maximum near 5 bohr. Calculated transition probabilities and radiative lifetimes for theA1Pgr;ndash;X1Sgr;+andE1Sgr;+ndash;X1Sgr;+band systems agree well with recent laboratory experiments. Absorption cross sections as a function of wavelength have been computed and used to determine the opacity of SiO boundary layers that will form on the surface of probe vehicles entering the Jovian atmosphere at high speeds. These calculations demonstrate that the brilliant shock layer emission will be significantly absorbed by the SiOA1Pgr;ndash;X1Sgr;+and SiOE1Sgr;+ndash;X1Sgr;+band systems in the boundary layer in the spectral region between 170 and 230 nm.
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