VACUUM UV STUDY OF THE PHOTOCHEMISTRY OF TRANSIENT DIATOMIC C-BEARING MOLECULES

Xu, Zhongxing

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Description

Title

VACUUM UV STUDY OF THE PHOTOCHEMISTRY OF TRANSIENT DIATOMIC C-BEARING MOLECULES

Author(s)

Xu, Zhongxing

Contributor(s)

Crabtree, Kyle N.; Ng, Cheuk-Yiu ; Jackson, William M.; Federman, Steven ; Wang, Lee-Ping ; Luo, Nan ; Chang, Yih-Chung

Issue Date

26-Jun-20

Keyword(s)

Electronic structure, potential energy surfaces

Abstract

The chemical evolution in photon-dominated regions (PDRs), including some diffuse interstellar clouds and protoplanetary disks, is closely related to photochemistry triggered by vacuum ultraviolet (VUV) photons, which act as the most important source of energy in such astronomical enviroments. Though the photodissociation and photoionization of transient diatomic C-bearing molecules play an important role in the chemical network of carbon in space, a lack of laboratory studies and theoretical calculations of their high-lying excited states impedes accurate modeling of their photochemistry and interpretation of astronomical observations. We have investigated the photochemistry of two molecules CS and \ce{C2} in the VUV region. Experimentally, the molecules are generated by photolysis or discharge of corresponding precursors and then supersonically expanded into a vacuum chamber, where they are interrogated by state-selective VUV-VUV spectroscopy coupled with velocity map imaging. In combination with new accurate \textit{ab initio} calculations, our study contributes quantitative data for use in photochemical databases.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

English

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http://hdl.handle.net/2142/107506

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