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Title:Electron anisotropy as a signature of mode specific isomerization in vinylidene
Author(s):Gibson, Stephen T.
Contributor(s):Field, Robert W.; Lineberger, Carl; Neumark, Daniel; Mabbs, Richard; Laws, Benjamin A.
Subject(s):Spectroscopy of Large Amplitude Motions
Abstract:[RESEARCH SUPPORTED BY THE AUSTRALIAN RESEARCH_X000D_ COUNCIL DISCOVERY PROJECT GRANT DP160102585] The nature of the isomerization process that turns vinylidene into acetylene has been awaiting advances in experimental methods, to better define fractionation widths beyond those available in the seminal 1989 photoelectron spectrum measurement.\footnote{K. M. Ervin, J. Ho, and W. C. Lineberger, \emph{J. Chem. Phys.} \textbf{91}, 5974 (1989). doi:10.1063/1.457415} This has proven a challenge. The technique of velocity-map imaging (VMI) is one avenue of approach. Images of electrons photodetached from vinylidene negative-ions, at various wavelengths, 1064~nm shown, provide more detail, including unassigned structure, but only an incremental improvement in the instrument line width. Intriguingly, the VMIs demonstrate a mode dependent variation in the electron anisotropy. Most notable in the figure, the inner-ring transition clusters are discontinuously, more isotropic. Electron anisotropy may provide an alternative key to examine the character of vinylidene transitions, mediating the necessity for an extreme resolution measurement. Vibrational dependent anisotropy has previously been observed in diatomic photoelectron spectra, associated with the coupling of electronic and nuclear motions.\footnote{M. van Duzor \emph{et al.} \emph{J. Chem. Phys.} \textbf{133}, 174311 (2010). doi:10.1063/1.3493349}
Issue Date:2016-06-20
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper/Presentation
Sponsor:Research supported by the Australian Research Council Discovery Project Grant dp160102585.
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2016-08-22

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