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 Title: Ultraviolet Photodissociation Dynamics Of The 3-cyclohexenyl Radical Author(s): Lucas, Michael Contributor(s): Zhang, Jingsong; Minor, Jasmine; Bryant, Raquel; Liu, Yanlin Subject(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. Issue Date: 2014-06-17 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Lucas, M.; Zhang, J.; Minor, J.; Bryant, R.; Liu, Y. ULTRAVIOLET PHOTODISSOCIATION DYNAMICS OF THE 3-CYCLOHEXENYL RADICAL. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TC05 Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/51134 DOI: https://doi.org/10.15278/isms.2014.TC05 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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