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    Ultraviolet laser irradiation of low concentration liquid microjets: Solute evaporation and solvent initiated reactivity

    Access Status
    Fulltext not available
    Authors
    Holstein, W.
    Dobeck, L.
    Otten, D.
    Metha, G.
    Buntine, Mark
    Date
    2003
    Type
    Journal Article
    
    Metadata
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    Citation
    Holstein, Wendy L. and Dobeck, Laura M. and Otten, Dale E. and Metha, Gregory F. and Buntine, Mark A. 2003. Ultraviolet laser irradiation of low concentration liquid microjets: Solute evaporation and solvent initiated reactivity. Australian Journal of Chemistry 56 (5): pp. 481-487.
    Source Title
    Australian Journal of Chemistry
    DOI
    10.1071/CH03011
    ISSN
    00049425
    URI
    http://hdl.handle.net/20.500.11937/39994
    Collection
    • Curtin Research Publications
    Abstract

    Resonance-enhanced 266 nm 1 + 1 multiphoton ionization has been used in conjunction with a liquid microjet time-of-flight mass spectrometer to explore the photochemistry of a 10–3 M solution of anisole in ethanol. Only ions generated in the condensed phase originating from the three-photon non-resonant ionization of the ethanol solvent are liberated into the vacuum. No solute ions generated in solution are observed unless the concentration is increased to 1 M. Under high concentration conditions, solute pairing or aggregation at the liquid surface is a necessary precursor towards liberating solute photoions into the vacuum via a Coulombic explosion. At a solution concentration of 10–3 M, a decreased solute ion density at the liquid surface is insufficient to initiate a Coulombic explosion into the vacuum. Rather, non-resonantly generated solvent ions on the liquid surface dominate the ion ejection process. Related studies on 10–3 M solutions of 4-methoxyphenol in both ethanol and water show that at this concentration solute ionization is most likely to be observed following thermal evaporation from the surface of a liquid beam.

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