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| - Fate of Reactive Intermediates Formed in Acetaldehyde under Exposure to Low-EnergyElectrons
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| - Chemical reactions have been induced in condensed acetaldehyde by exposure to low-energy electrons asdemonstrated by use of high-resolution electron energy loss (HREEL) spectroscopy and thermal desorptionspectroscopy (TDS). The HREEL spectra show that the acetaldehyde film is modified significantly when theincident electron energy is increased above 10 eV. Release of CO upon exposure to electrons at an incidentenergy of 14 eV is observed by electronic HREEL spectra. The changes in the vibrational spectra uponexposure of the molecular film to electrons at an incident energy of 15.5 eV are analyzed in detail usingreference spectra for a number of potential product molecules. TDS data reveal clearly the decomposition ofacetaldehyde and formation of CO and CH4 as major products under electron exposure. The combined resultsalso give evidence for the formation of propionaldehyde. Other less prominent products are acetone andpossibly an alcoholic species. A reaction mechanism is suggested that rationalizes the formation of largerproducts. It involves fragmentation of the molecule releasing CO, abstraction of an H atom from an adjacentacetaldehyde by the H radical fragment, and, finally, recombination of the resulting radical with the remainingCH3 fragment.
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