Observation of b${}_2$ symmetry vibrational levels of the SO${}_2$ $\tilde{\mbox{C}}$ ${}^1$B${}_2$ state: Vibrational level staggering, Coriolis interactions, and rotation-vibration constants

Abstract

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 SO bond lengths. However, low-lying levels with odd quanta of antisymmetric stretch (b${}_2$ vibrational symmetry) have not previously been observed because transitions into these levels from the zero-point level of the $\tilde{\mathrm{X}}$ state are vibronically forbidden. We use IR-UV double resonance to observe the b${}_2$ vibrational levels of the $\tilde{\mathrm{C}}$ state below 1600 cm${}^{-1}$ of vibrational excitation. This enables a direct characterization of the vibrational level staggering that results from the double-minimum potential. In addition, it allows us to deperturb the strong $c$-axis Coriolis interactions between levels of a${}_1$ and b${}_2$ vibrational symmetry, and to determine accurately the vibrational dependence of the rotational constants in the distorted $\tilde{\mathrm{C}}$ electronic state.

References in corpus (3)

• Observation of b${}_2$ symmetry vibrational levels of the SO${}_2$ $\tilde{\mbox{C}}$ ${}^1$B${}_2$ state: Vibrational level staggering, Coriolis interactions, and rotation-vibration constants
• The rotation-vibration structure of the SO${}_2$ ${\tilde{\mathrm{C}}}^1{\mathrm{B}}_2$ state explained by a new internal coordinate force field
• 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

Cited by in corpus (4)

• Observation of b${}_2$ symmetry vibrational levels of the SO${}_2$ $\tilde{\mbox{C}}$ ${}^1$B${}_2$ state: Vibrational level staggering, Coriolis interactions, and rotation-vibration constants
• The rotation-vibration structure of the SO${}_2$ ${\tilde{\mathrm{C}}}^1{\mathrm{B}}_2$ state explained by a new internal coordinate force field
• 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
• Final State Resolved Quantum Predissociation Dynamics of SO2(C1B2) and Its Isotopomers via a Crossing with a Singlet Repulsive State