INFRARED RESONANCE ENHANCED PHOTODISSOCIATION SPECTROSCOPY OF $Si^{+}(CO_{2})_{n}$, $Si^{+}(CO_{2})_{n}Ar$, AND $Si^{+}(O_{2})(CO_{2})_{n}$ CLUSTERS
Loading...
Date
2003
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Weakly bound $Si^{+}(CO_{2})_{n}$, $Si^{+}(CO_{2})_{n}Ar$, and $Si^{+}(O_{2})(CO_{2})_{n}$ complexes are produced by laser vaporization in a pulsed supersonic expansion. The ions are then mass selected in a reflectron time-of-flight mass spectrometer where they are photodissociated by a tunable infrared OPO/OPA laser system near the asymmetric stretch $(\nu_{3})$ of $CO_{2}$. Dissociation is more efficient on resonance, thus monitoring the fragmentation channel as a function of infrared laser frequency produces the IR absorption spectrum for the complex of interest. $Si^{+}(CO_{2})_{n}$ and $Si^{+}(O_{2})(CO_{2})_{n}$ clusters fragment by the loss of whole $CO_{2}$ units while $Si^{+}(CO_{2})_{n}Ar$ complexes fragment by the loss of argon. Interpretation of the observed infrared spectra will be discussed.
Description
Author Institution: Department of Chemistry, University of Georgia