Issue 11, 2020

State-to-state photodissociation dynamics of CO2 around 108 nm: the O(1S) atom channel

Abstract

State-to-state photodissociation of carbon dioxide (CO2) via the 3p1Πu Rydberg state was investigated by the time-sliced velocity map ion imaging technique (TSVMI) using a tunable vacuum ultraviolet free electron laser (VUV FEL) source. Raw images of the O(1S) products resulting from the O(1S) + CO(X1Σ+) channel were acquired at the photolysis wavelengths between 107.37 and 108.84 nm. From the vibrational resolved O(1S) images, the product total kinetic energy releases and the vibrational state distributions of the CO(X1Σ+) co-products were obtained, respectively. It is found that vibrationally excited CO co-products populate at as high as v = 6 or 7 while peaking at v = 1 and v = 4, and most of the individual vibrational peaks present a bimodal rotational structure. Furthermore, the angular distributions at all studied photolysis wavelengths have also been determined. The associated vibrational-state specific anisotropy parameters (β) exhibit a photolysis wavelength-dependent feature, in which the β-values observed at 108.01 nm and 108.27 nm are more positive than those at 107.37 nm and 107.52 nm, while the β-values have almost isotropic behaviour at 108.84 nm. These experimental results indicate that the initially prepared CO2 molecules around 108 nm should decay to the 41A′ state via non-adiabatic coupling, and dissociate in the 41A′ state to produce O(1S) + CO(X1Σ+) products with different dissociation time scales.

Graphical abstract: State-to-state photodissociation dynamics of CO2 around 108 nm: the O(1S) atom channel

Article information

Article type
Paper
Submitted
23 dek 2019
Accepted
19 fev 2020
First published
20 fev 2020

Phys. Chem. Chem. Phys., 2020,22, 6260-6265

State-to-state photodissociation dynamics of CO2 around 108 nm: the O(1S) atom channel

J. Zhou, Z. Luo, J. Yang, Y. Chang, Z. Zhang, Y. Yu, Q. Li, G. Cheng, Z. Chen, Z. He, L. Che, S. Yu, G. Wu, K. Yuan and X. Yang, Phys. Chem. Chem. Phys., 2020, 22, 6260 DOI: 10.1039/C9CP06919D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements