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VUV photophysics of acetonitrile: Fragmentation, fluorescence and ionization in the 7–22 eV region by Martin Schwell; Hans-Werner Jochims; Helmut Baumgärtel; Sydney Leach is a Physics and Astronomy article available to read on EtoBox.

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VUV induced photodissociation of gaseous acetonitrile was studied in the 7-22 eV range using synchrotron radiation excitation, photofragment fluorescence spectroscopy and photoion mass spectrometry (PIMS). CN(A-X), CN(B-X) and CH(A-X) emissions were observed. Their relative intensities were studied by fluorescence excitation (FEX) spectroscopy. The fluorescence quantum yield for CN(B-X) emission is of the order of 1.5%, whereas that of CN(A-X) is of the order of 0.5%, relatively independent of excitation wavelength in the 9-20 eV region. The CN FEX spectra follow quite closely the photoabsorption spectrum. The total photoionization quantum yield of CH 3 CN was measured up to 22 eV. The structures in the yield curve were related to photoabsorption features. The total photoionization quantum yield is about 0.5 at 13.131 eV, the energy of the first excited state of the ion; it reaches unity at about 21.3 eV. Dissociative reaction channels forming neutral products are discussed in detail. The results of this study and of an associated VUV absorption spectroscopy study of acetonitrile are used to discuss aspects of the interpretations of astrophysical observations of acetonitrile in the

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Author

Martin Schwell; Hans-Werner Jochims; Helmut Baumgärtel; Sydney Leach

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0301-0104)

Published

2008

Language

EN

Field

Physics and Astronomy (Physical Sciences)