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ULTRAVIOLET PHOTODISSOCIATION DYNAMICS OF THE 1-PROPENYL RADICAL

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/52254

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Title: ULTRAVIOLET PHOTODISSOCIATION DYNAMICS OF THE 1-PROPENYL RADICAL
Creators: Lucas, Michael; Song, Yu; Zhang, Jingsong; Brazier, Christopher
Issue Date: 2012
Abstract: Ultraviolet (UV) photodissociation dynamics of jet-cooled 1-propenyl radical (C${_3}$H${_5}$) were studied in the photolysis wavelength region of 224 to 248 nm using high-n Rydberg atom time-of-flight (HRTOF) and resonance enhanced multiphoton ionization (REMPI) techniques. The 1-propenyl radical were produced from 193-nm photolysis of 1-chloropropene and 1-bromopropene precursors. The H-atom photofragment yield (PFY) spectra have a broad peak centered around 230 nm. The H + C${_3}$H${_4}$ product translational energy distributions, P(E${_T}$)'s, peak near $\sim$ 10 kcal/mol, and the fraction of average translational energy in the total excess energy, $\langle$f${_T}$$\rangle$, is nearly a constant of $\sim$ 0.14 from 224 to 248 nm. The P(E${_T}$)'s along with recent theoretical calculations indicate that H + propyne dissociation is the predominant H-atom product channel. The H-atom product angular distribution is isotropic, with the anisotropy parameter $\beta$ $\sim$ 0. The dissociation mechanism is consistent with unimolecular dissociation of hot 1-propenyl radical after internal conversion from the electronically excited state.
URI: http://hdl.handle.net/1811/52254
Other Identifiers: 2012-RE-07
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