Autodetachment of CH2CN− viewed with high resolution photoelectron imaging

Laws, Benjamin A.

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https://hdl.handle.net/2142/104232 Copy

Description

Title

Autodetachment of CH2CN− viewed with high resolution photoelectron imaging

Author(s)

Laws, Benjamin A.

Contributor(s)

• Mabbs, Richard
• Gibson, Stephen T.

Issue Date

2019-06-19

Keyword(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}

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/104232

DOI

https://doi.org/10.15278/isms.2019.WF03

Copyright and License Information

Copyright 2019 Benjamin A. Laws

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