Ultraviolet Photodissociation Dynamics Of The 3-cyclohexenyl Radical

Lucas, Michael

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https://hdl.handle.net/2142/51134 Copy

Description

Title

Ultraviolet Photodissociation Dynamics Of The 3-cyclohexenyl Radical

Author(s)

Lucas, Michael

Contributor(s)

• Zhang, Jingsong
• Minor, Jasmine
• Bryant, Raquel
• Liu, Yanlin

Issue Date

2014-06-17

Keyword(s)

Mini-symposium: Spectroscopy in Kinetics and Dynamics

Abstract

The ultraviolet (UV) photodissociation dynamics of the cyclohexenyl radical (\textit{c}-\chem{C_6H_9}) was studied for the first time in the photolysis region of 232-262 nm using the high-\textit{n} Rydberg atom time-of-flight (HRTOF) technique. The cyclohexenyl radical was produced by the 193 nm photodissociation of 3-chlorocyclohexene and 3-bromocyclohexene. The H-atom photofragment yield (PFY) spectrum contains a broad peak centering around 250 nm, in good agreement with the UV absorption spectra of the $^{2}$B$_{1}$ $\leftarrow$ $^{2}$A$_{2}$ transition in cyclohexenyl. The translational energy distributions of the H-atom loss product channel, \textit{P}(\textit{E}$_{T}$)’s, for cyclohexenyl show a modest translational energy release peak at $\sim$ 10 kcal/mol. The fraction of average translational energy in the total excess energy, $<$\textit{f}$_{T}$$>$, is $\sim$ 0.16 from 232-262 nm. The H-atom product angular distribution is isotropic with a $\beta$ parameter $\sim$ 0. The dissociation mechanism is a statistical unimolecular dissociation of a hot radical following internal conversion from the excited electronic state to produce the lowest energy product, H + cyclohexadiene. The dissociation mechanisms of the cyclohexenyl radical and cyclohexyl radical will be compared.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51134

DOI

https://doi.org/10.15278/isms.2014.TC05

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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