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Type: Journal article
Title: Ultraviolet laser irradiation of low concentration liquid microjets: Solute evaporation and solvent initiated reactivity
Author: Holstein, W.
Dobeck, L.
Otten, D.
Metha, G.
Buntine, M.
Citation: Australian Journal of Chemistry: an international journal for chemical science, 2003; 56(5):481-487
Publisher: C S I R O Publishing
Issue Date: 2003
ISSN: 0004-9425
Statement of
Wendy L. Holstein, Laura M. Dobeck, Dale E. Otten, Gregory F. Metha and Mark A. Buntine
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.
Description: © CSIRO 2003
DOI: 10.1071/CH03011
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