Vibrational mode-specific autodetachment and coupling of CH2CN-

Lyle, Justin

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https://hdl.handle.net/2142/96982 Copy

Description

Title

Vibrational mode-specific autodetachment and coupling of CH2CN-

Author(s)

Lyle, Justin

Contributor(s)

Mabbs, Richard

Issue Date

2017-06-20

Keyword(s)

Multiple potential energy surfaces

Abstract

The Cyanomethyl Anion, CH$_{2}$CN-, and neutral radical have been studied extensively, with several findings of autodetachment about the totally symmetric transition, as well as high resolution experiments revealing symmetrically forbidden and weak vibrational features. We report photoelectron spectra using the Velocity-Mapped Imaging Technique in 1-2 wn increments over a range of 13460 to 15384 wn that has not been previously examined. These spectra include excitation of the ground state cyanomethyl anion into the direct detachment thresholds of previously reported vibrational modes for the neutral radical. Significant variations from Franck-Condon behavior were observed in the branching ratios for resolved vibrational features for excitation in the vicinity of the thresholds involving the nub{3} and nub{5} modes. These are consistent with autodetachment from rovibrational levels of a dipole bound state acting as a resonance in the detachment continuum. The autodetachment channels involve single changes in vibrational quantum number, consistent with the vibrational propensity rule but in some cases reveal relaxation to a different vibrational mode indicating coupling between the modes and/or a breakdown of the normal mode approximation.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/96982

DOI

https://doi.org/10.15278/isms.2017.TG10

Copyright and License Information

Copyright 2017 Justin Lyle

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