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

Literature Information

Publication Date 2021-12-30
DOI 10.1039/D1CP04628D
Impact Factor 3.676
Authors

Evangelia Sakkoula, Gautam Sharma, Xingan Wang, Simon W. North, David H. Parker, Wei Wei


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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 transition dipole moment of the parent molecule, recoil velocity vector and rotational angular momentum vector of the photofragments were extracted from the anisotropic angular distributions of the images. The vector correlations extracted indicated a picture of photodissociation mainly via the excited 21A′ (A) state. The transition dipole moment lies in the bending molecular plane, and the is pointing perpendicular to the plane, while the μ–v vectors angle is between 41°–45°. In addition, a clear trend was observed. As the product CO rotational state j increases, the spatial anisotropy parameter (β ≡ 2β20(20)) decreases. This j-dependent attenuation of spatial anisotropy parameter can be explained mainly with the consideration of non-axial recoil effect. These results are in good agreement with both theoretical work and previous experimental work.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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