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 Title: AUTODETACHMENT OF CH2CN− VIEWED WITH HIGH RESOLUTION PHOTOELECTRON IMAGING Author(s): Laws, Benjamin A Contributor(s): Mabbs, Richard ; Gibson, Stephen T Subject(s): Ions Abstract: \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.45, clip]{CH2CN-resonance.eps} \end{wrapfigure} Previous studies of the cyanomethyl radical CH$_2$CN$^-$ have observed sharp resonances in the photoelectron spectrum of the anion, that occur due to the existence of a dipole bound state (DBS).\footnote{M. L. Weichman, J. B. Kim, and D. M. Neumark, \emph{J. Chem. Phys.} {\bf 140}, 104305 (2014)}\footnote{J. Lyle, O. Wedig, S. Gulania, A. Krylov, and R. Mabbs, \emph{J. Chem. Phys.} {\bf 147}, 234309, (2017)} At specific detachment wavelengths, the anion may be excited to the DBS, which subsequently autodetaches. Autodetachment transitions may be readily identified in the anion photoelectron spectrum by both their sensitivity to laser wavelength, and the differing relationship between photon and electron energy. This study investigates CH$_2$CN$^-$ using high-resolution photoelectron imaging. Spectra were recorded at a range of wavelengths from $355-780$ nm, with resonances observed at $hv = 662,~722,~725,$ and $767$ nm. These measurements resolve the $K$-rotational structure of the molecule, allowing for the exact rotational transitions involved in the autodetachment to be identified. The spectra are further complicated by the presence of vibronic coupling between the neutral ground $^2B_1$ and excited $^2A_1$ states, which may be identified from changes in the anisotropy of the electron distribution. \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/2142/104232 DOI: 10.15278/isms.2019.WF03 Rights Information: Copyright 2019 Benjamin A Laws Date Available in IDEALS: 2019-07-152020-01-25
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