Multiphoton ionization/dissociation of osmium tetroxide

D. Ding, A. A. Puretzky, R. N. Compton

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Abstract

The mechanisms leading to laser multiphoton ionization and dissociation (MPI/MPD) of osmium tetroxide (OsO4) have been investigated from measurements of the kinetic energies of product ions (Os+, Os 2+, OsO+, O2+, O+) and photoelectrons as a function of the laser wavelength. Neutral channels, intermediate to the dominant Os+ ionization channel, such as OsO 4 → OsO4-n+nO are examined using resonance-enhanced multiphoton ionization (REMPI) of the fast O atoms. Equipartition of the available photon energy among the fragments is observed. The wavelength dependence of the Os+ ion signal suggests that one or more of the steps leading to Os+ ions involve molecular ions and/or excited neutral atoms. The observed preponderance of very slow (<0.2 eV) electrons also supports this interpretation. Os2+ is shown to result primarily from REMPI of Os+.

Original languageEnglish
Pages (from-to)951-958
Number of pages8
JournalJournal of Chemical Physics
Volume98
Issue number2
DOIs
StatePublished - 1993
Externally publishedYes

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