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Valence shell electronic spectroscopy of isoprene studied by theoretical calculations and by electron scattering, photoelectron, and absolute photoabsorption measurements

Martins, G.; Ferreira-Rodrigues, A. M.; Rodrigues, F. N.; de Souza, G. G. B.; Mason, N. J.; Eden, S.; Duflot, D.; Flament, J.-P.; Hoffmann, S. V.; Delwiche, J.; Hubin-Franskin, M.-J. and Limão-Vieira, P. (2009). Valence shell electronic spectroscopy of isoprene studied by theoretical calculations and by electron scattering, photoelectron, and absolute photoabsorption measurements. Physical Chemistry Chemical Physics, 11(47) pp. 11219–11231.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1039/b916620c
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Abstract

The first ab initio calculations (vertical energies and oscillator strengths) are reported for the neutral electronic transitions of isoprene (2-methyl-1,3-butadiene), CH2CHC(CH3)CH2. The VUV photoabsorption spectroscopy of the molecule is presented in the energy range 4.6 to 10.8 eV (270–125 nm) with the highest resolution yet reported above 6.05 eV, revealing new spectral features. Valence and Rydberg transitions have been assigned in accordance with the theoretical results and the associated vibronic series have been analysed. The absolute photoabsorption cross sections at energies below 6.89 eV have been used to calculate the photolysis lifetime of isoprene in the upper stratosphere (20–50 km). Electron energy loss spectroscopy (EELS) measurements have enabled further photoabsorption cross sections to be derived in the range 9–28 eV. The first ab initio calculations have been carried out to determine excitation energies to the lowest energy ionic states of isoprene. The calculations are compared with the He(I) photoelectron spectrum (8 to 17 eV) and new vibrational structure is observed in the first photoelectron band.

Item Type: Journal Article
Copyright Holders: 2009 Royal Society of Chemistry
ISSN: 1463-9076
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
eSTEeM
Item ID: 18738
Depositing User: Users 9108 not found.
Date Deposited: 26 Oct 2009 15:49
Last Modified: 05 Mar 2014 10:29
URI: http://oro.open.ac.uk/id/eprint/18738
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