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The photodissociation of CH3I in the red edge of the A-band: Comparison between slice imaging experiments and multisurface wave packet calculations

J. Chem. Phys. 131, 174309 (2009); doi:10.1063/1.3257692

Published 5 November 2009

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L. Rubio-Lago,1,2 A. García-Vela,3 A. Arregui,1 G. A. Amaral,1 and L. Bañares1
1Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Madrid 28040, Spain
2Instituto de Estructura de la Materia, CSIC, C/Serrano, 123, Madrid 28006, Spain
3Instituto de Física Fundamental, CSIC, C/Serrano, 123, Madrid 28006, Spain
The photodissociation of methyl iodide at different wavelengths in the red edge of the A-band (286–333 nm) has been studied using a combination of slice imaging and resonance enhanced multiphoton ionization detection of the methyl fragment in the vibrational ground state (nu=0). The kinetic energy distributions (KED) of the produced CH3(nu=0) fragments show a vibrational structure, both in the I(2P3/2) and I*(2P1/2) channels, due to the contribution to the overall process of initial vibrational excitation in the nu3(C–I) mode of the parent CH3I. The structures observed in the KEDs shift toward upper vibrational excited levels of CH3I when the photolysis wavelength is increased. The I(2P3/2)/I*(2P1/2) branching ratios, photofragment anisotropies, and the contribution of vibrational excitation of the parent CH3I are explained in terms of the contribution of the three excited surfaces involved in the photodissociation process, 3Q0, 1Q1, and 3Q1, as well as the probability of nonadiabatic curve crossing 1Q1<--3Q0. The experimental results are compared with multisurface wave packet calculations carried out using the available ab initio potential energy surfaces, transition moments, and nonadiabatic couplings, employing a reduced dimensionality (pseudotriatomic) model. A general qualitative good agreement has been found between theory and experiment, the most important discrepancies being in the I(2P3/2)/[I(2P3/2)+I*(2P1/2)] branching ratios. Inaccuracies of the available potential energy surfaces are the main reason for the discrepancies. ©2009 American Institute of Physics
History: Received 24 August 2009; accepted 10 October 2009; published 5 November 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/174309/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.80.Gj
    Diffuse molecular spectra; predissociation, photodissociation
  • 31.15.A-
    Ab initio calculations (atoms and molecules)
  • 33.15.Mt
    Molecular rotation, vibration, and vibration-rotation constants
  • 33.80.Rv
    Multiphoton ionization and excitation to highly excited states in molecules
  • 33.80.Eh
    Autoionization, photoionization, and photodetachment of molecules
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

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