The origin of unequal bond lengths in the $\tilde{\mathrm{C}}$ ${}^1$B${}_2$ state of SO${}_2$: Signatures of high-lying potential energy surface crossings in the low-lying vibrational structure

G. Barratt Park, Jun Jiang, Robert W. Field

The $\tilde{\mathrm{C}}$ ${}^1$B${}_2$ state of SO${}_2$ has a double-minimum potential in the antisymmetric stretch coordinate, such that the minimum energy geometry has nonequivalent S…