Abstract
The ultraviolet photoelectron spectrum (hν=3.531 eV) of SO− shows transitions to the three lowest lying electronic states of SO neutral. The electron affinity of SO was determined to be 1.125(5) eV. The harmonic vibrational frequency and the spin-orbit splitting of the SO− electronic ground state (2Π) were also determined. Franck–Condon analyses of the SO vibrational progressions were used in conjunction with the molecular constants of the well-characterized SO neutral molecule to determine the equilibrium bond length of SO− [re=1.570(5) Å].
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