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Mechanism of ion ejection from a liquid beam following laser photoionization

✍ Scribed by Fumitaka Mafuné; Jun-ya Kohno; Takashi Nagata; Tamotsu Kondow

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
460 KB
Volume
218
Category
Article
ISSN
0009-2614

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✦ Synopsis

An anisole+%hanol solution was introduced into vacuum as a continuous liquid flow (liquid beam), and the molecules in the liquid beam were. ionized by laser two-photon ionization. Ions ejected from the liquid beam were extracted by applying a pulsed electric field for the measurement of time-of-flight mass spectra of the ions. The intensities and peak profiles of the ions were measured by varying the &lay time from the laser ionization to the pulse extraction of the ions at different laser powers. All the ions observed have almost the same velocity ( = 700 m s-' ) and need z 1 us to leave the liquid beam after laser irradiation. This finding implies that each photoion forming a solvation structure with almost the same number of solvent molecules is expelled from the liquid surface by Coulomb ejection and is dissociated into a cluster ion outside the influence of the Coulomb potential. The rate constants for ion ejection were determined.

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