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 Title: AUTODETACHMENT AND VIBRONIC COUPLED PHOTODETACHMENT TRANSITIONS OF C2H3O− Author(s): Gibson, Stephen T Contributor(s): Laws, Benjamin A Subject(s): Ions Abstract: \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.7, clip]{C2H3O-PESvsMiller.eps} \end{wrapfigure} The photoelectron spectrum of the vinoxy anion C$_2$H$_3$O$^-$ is studied using velocity-imaging, with the angular distributions providing electronic-state and vibrational-mode specific characterization. A 355~nm photoelectron spectrum, together with anisotropy parameters determined for some of the stronger transitions is show in the figure. Photodetachment at longer wavelengths have also been measured. The spectroscopic analysis builds on a previous SEVI\footnote{Slow-Electron-Velocity-map-Imaging: Yacovitch \emph{et al.} J Chem Phys \textbf{130} 244309 (2009) doi:10.1063/1.3157208} study, and a CRDS\footnote{Cavity-Ring-Down-Spectroscopy: Thomas \emph{et al.} J Chem Phys \textbf{132} 114302 (2010) doi:10.1063/1.3352976} work. Forbidden asymmetric vibrational modes may gain intensity through vibronic coupling between the neutral ground state and an excited state, of the correct symmetry, and have an anomalous anisotropy parameter. The positive $\tilde{X}$ transition is $9^2_0 11^1_1$. In addition, the vinoxy anion has dipole-bound excited electronic states, that produce very narrow transitions. For C$_2$H$_3$O$^-$ there is evidence of autodetachment from dipole-bound states of the anion, and vibronic coupling of the neutral ground state. \makeatletter{\renewcommand*{\@makefnmark}{}\footnotetext{Research supported by the Australian Research Council Discovery Project Grant DP160102585.}\makeatother} Issue Date: 2019-06-19 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/104507 DOI: 10.15278/isms.2019.WF07 Rights Information: Copyright 2019 Stephen T Gibson Date Available in IDEALS: 2019-07-152020-01-25
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