Dynamics and vector correlations of vacuum ultraviolet (VUV) photodissociation of CO₂ at 155 nm

Abstract

In this work, the CO2 Vacuum Ultraviolet (VUV) photodissociation dynamics of the dominant O(1D) channel near 155 nm have been studied using Velocity Map Imaging (VMI) technique. Correlations among the...

State-to-state photodissociation dynamics of CO2 at 157 nm

“…6 shows a non-axial model prediction for the CO 2 ( v 2 = 0) + hν → CO( v = 0) + O( 1 D) channel from ref. 16, which agrees well with the experimental data of this study. The best fit parameters R c = 5.8 Å and ϕ = 38° used here were derived as described in detail in ref.…”

“…The best fit parameters R c = 5.8 Å and ϕ = 38° used here were derived as described in detail in ref. 16 which covered a range of dissociation wavelengths around 155 nm with polarization sensitive CO( v = 0) detection. 16 Because the dissociation wavelengths are close, the good agreement found when using the same best fit parameters is expected, and the fact that similar results are found using a quite different product detection method for both co-products confirms the quality of the present data.…”

“…The overall anisotropy parameters were consistent with a fast dissociation process driven by a parallel photo-excitation. Sakkoula et al 16 studied O( 1 D) + CO( X 1 Σ + ) channel of CO 2 molecule using one-color VUV radiation around 155 nm. A full set of vector correlations extracted were extracted from the anisotropic angular distributions of the CO( v = 0) product images.…”

Ultrafast CO2 photodissociation in the energy region of the lowest Rydberg series

“…In the previous work Rydberg states were not considered in the accompanying theoretical computations and our contribution here gives caveats since this 4 1 A 0 -3 1 A 0 mechanism is widely cited now. [2][3][4] Accurate and comprehensive electronic structure computations of the CO 2 molecule using CASSCF, MRCI and EOM-CCSD methods have been championed by Grebenschchikov with the analysis of the multidimensional potential energy surfaces (PESs) for the lowest states [5][6][7] but also for superexcited states, 8 thus announcing the complex landscape to be considered when carrying out photodynamical studies in CO 2 .…”

“…In the previous work Rydberg states were not considered in the accompanying theoretical computations and our contribution here gives caveats since this 4 1 A′ → 3 1 A′ mechanism is widely cited now. 2–4…”