DECIPHERING THE DYNAMICS AND VECTOR CORRELATIONS OF VACUUM ULTRAVIOLET (VUV) PHOTODISSOCIATION OF CO₂ AT 155 NM

Wei, Wei

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Description

Title

DECIPHERING THE DYNAMICS AND VECTOR CORRELATIONS OF VACUUM ULTRAVIOLET (VUV) PHOTODISSOCIATION OF CO₂ AT 155 NM

Author(s)

Wei, Wei

Contributor(s)

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

Issue Date

2023-06-21

Keyword(s)

Mini-symposium: Spectroscopy at Large-scale Facilities

Abstract

The Vacuum Ultraviolet (VUV) photodissociation of CO₂ via the dominant O(¹D) channel near 155 nm were studied using Velocity Map Imaging (VMI) technique. Speed dependent vector correlations (the correlations among the transition dipole moment µ of the parent molecule, the recoil velocity vector v and rotational angular momentum vector j of the photofragments) were extracted. This was made possible via the application of a set of equations first developed by Grubb et al. And in combination with a Monte Carlo style simulation program and necessary approximations, full vector correlation information were extracted from the anisotropic angular distributions of the images. Our results indicated a picture of photodissociation dynamics mainly via the excited 2¹A’ (A) state. The transition dipole moment lies in the bent molecular plane. It was not parallel, but pointing away from the dissociating C-O bond. In addition, speed dependent µ -v correlation showed a clear trend, with higher rotationally excited CO correlating to larger angle between µ and the recoil direction. Such clear trend was successfully explained with a mathematical model (first developed by Reisler and coworkers) considering non-axial recoil effect. Although 1¹A” (B) state was also energetically available, we do not believe it was involved in this case.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122516

DOI

https://doi.org/10.15278/isms.2023.6991

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