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Dynamics of the photodissociation of ethyl iodide from the origin of the B band. A slice imaging study

Abstract

The photodissociation dynamics and stereodynamics of ethyl iodide from the origin of the sec- ond absorption B-band have been investigated combining pulsed slice imaging with resonance enhanced multiphoton ionization (REMPI) detection of all fragments, I(2P3/2), I*(2P1/2) and C2H5. The I*(2P1/2) atom action spectrum recorded as a function of the excitation wavelength permits to identify and select the 00 origin of this band at 201.19 nm. Translational energy distributions and angular distributions for all fragments and semiclassical Dixon’s bipolar moments for the C2H5 fragment are presented and discussed along with high-level ab initio calculations of potential en- ergy curves as a function of the C-I distance. A predissociative mechanism governs the dynamics where in a first step a bound Rydberg state corresponding to the 5pπI → 6sI transition is populated by the 201.19 nm-photon absorption. A curve crossing with a repulsive state located within the Franck-Condon geometry leads to direct dissociation into the major channel C2H5 + I*(2P1/2). A small amount of I(2P3/2) atoms is nevertheless observed and presumably attributed to a second curve crossing with a repulsive state from the A-band.

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Publication details

The article was received on 17 Oct 2018, accepted on 05 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8CP06482B
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Dynamics of the photodissociation of ethyl iodide from the origin of the B band. A slice imaging study

    S. Marggi Poullain, P. Recio, D. V. Chicharro, L. Rubio-Lago, J. Gonzalez-Vazquez and L. Banares, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP06482B

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