Infrared Spectra of Neutral Bent Carbon Dioxide

A combined ab initio and quantum dynamical study characterizes a family of bent neutral carbon dioxide molecules in terms of their vibrational levels, electric dipole moment surfaces, and infrared spectra in the gas phase. The considered isomers include the dioxiranylidene form of CO₂ with the equilibrium valence angle of 72°, belonging to the ground electronic state, and four open structures with the valence angles of 118°/119° (they belong to the singlet and triplet electronic states 2¹A' and 1³A', respectively) and 127°/128° (states 1¹A″ and 1³A″, respectively). All studied bent structures possess permanent dipole moments. For all isomers, the antisymmetric stretch fundamental is the strongest infrared transition. Individual bent molecules can be distinguished on the basis of strong absorption bands in the frequency window 1100-1800 cm^-1 as well as isotopic shifts in the progression of antisymmetric stretch mode. Excitation of bent neutral carbon dioxide near a perfect metal surface is also briefly discussed. It is argued that the excitation energy from the linear ground state exhibits a substantial red shift depending on the molecule-metal distance.