HIGH RESOLUTION ANION PHOTOELECTRON SPECTRA OF CRYOGENICALLY COOLED SILICON CARBIDES

Babin, Mark C

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https://hdl.handle.net/2142/107624 Copy

Description

Title

HIGH RESOLUTION ANION PHOTOELECTRON SPECTRA OF CRYOGENICALLY COOLED SILICON CARBIDES

Author(s)

Babin, Mark C

Contributor(s)

Neumark, Daniel ; DeWitt, Martin

Issue Date

23-Jun-20

Keyword(s)

Radicals

Abstract

Small silicon carbides are of particular interest to the astrochemical community given the appearance of SiC, SiC$_2$, Si$_2$C, and SiC$_3$ in the interstellar medium. Here, we report high resolution anion photoelectron spectra of cryogenically cooled SiC$_3^{-}$, Si$_2$C$_2^{-}$, and Si$_3$C$^-$, providing new insight into the geometric and vibronic structure of the corresponding neutral radicals. Comparison to theory suggests the anionic ground states for all three species are ring structures, with the ground state of Si$_2$C$_2^-$ being a distorted rhombic structure possessing a dipole moment. Detachment from these anions yield vibrational frequencies for the three neutral ring structures, with a number of Franck-Condon forbidden transitions being ascribed to Herzberg-Teller coupling to excited neutral states.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

English

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http://hdl.handle.net/2142/107624

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