Abstract
The singlet states of SiO that correlate with ground state atoms have been studied. The computed spectroscopic constants are in good agreement with experiment. The lifetime of the E state has been calculated to be 10.9ns; this is larger than the results of previous computations and is in excellent agreement with the experimental value of 10.5±1.1ns. The lifetime of the A state is about three times larger than found in experiment. We suggest that absorption from the X state to the (2)1Π state is responsible for the unidentified lines in the experiment of Hormes et al.
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