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Dynamics of multidissociation paths of acetaldehyde photoexcited at 157 nm: Branching ratios, distributions of kinetic energy, and angular anisotropies of products

J. Chem. Phys. 131, 174312 (2009); doi:10.1063/1.3262724

Published 6 November 2009

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Shih-Huang Lee
National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan
After the photolysis of acetaldehyde (CH3CHO) at 157.6 nm in a molecular-beam apparatus using photofragment translational spectroscopy and vacuum-ultraviolet photoionization to detect products, we observed 13 photofragments associated with six primary dissociation channels and secondary dissociation of products CH3CO and HCO. We measured time-of-flight spectra and spatial angular anisotropies of products and evaluated the branching ratios of products. All photoproducts have nearly isotropic angular distributions with an average |beta| value less than 0.05. Primary dissociations to CH3CO+H and CH3+HCO are two major paths; most CH3CO subsequently decomposes spontaneously to CH3+CO and CH2CO+H and most HCO decomposes to H+CO. The ternary dissociation to CH3+CO+H thus accounts for approximately half of the total branching. Dissociations to CH2CO+H2 and CH2+CH2O are observable, but the production of CH4+CO is ambiguous. The productions of C2H3+OH and C2H2+H2O indicate that isomerization from acetaldehyde to ethenol occurs before fragmentation. After photoexcitation to the n-3p state, most acetaldehyde converts into states T1 and S0 but a little isomerizes to ethenol followed by multichannel decomposition. ©2009 American Institute of Physics
History: Received 25 August 2009; accepted 20 October 2009; published 6 November 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/174312/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.50.Hp
    Chemical processes caused by visible and UV light
  • 82.80.Gk
    Chemical analytical methods involving vibrational spectroscopy
  • 82.30.Qt
    Isomerization and rearrangement in chemical reactions
  • 82.30.Lp
    Decomposition chemical reactions (pyrolysis, dissociation, and fragmentation)
  • YEAR: 2009

PUBLICATION DATA

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

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