Abstract
A liquid beam (continuous liquid flow in a vacuum) of a calcium iodide (CaI2) solution in ethanol (EtOH) was irradiated with a 220 nm laser, and ions ejected from the surface following multiphoton ionization were observed by a time-of-flight mass spectrometer. Cluster ions, CaOEt+(EtOH)m (m = 2−9), CaI+(EtOH)m (m = 1−7), and H+(EtOH)m (m = 3−5) were found to be produced. The measurement of the velocities of the product cluster ions indicates that two mechanisms are operative; ions formed on the liquid surface are ejected with accompanying solvent molecules, and ions generated by Coulomb explosion of a divalent cluster ion, Ca2+(EtOH)m, are repelled with gaining a sizable translational energy.
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