VIBRATIONAL SPECTROSCOPY OF MASS-SELECTED, MATRIX ISOLATED IONS: CHARGE NEUTRALITY AND ION REACTIONS
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Date
1995
Journal Title
Journal ISSN
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Publisher
Ohio State University
Abstract
The mass-selection matrix-isolation technique is discussed. Deposition of ${CF_{3}}^{-}$ from several precursors resulted in the accumulation of spectroscopically observable amounts of this ion and very small amounts of neutralization product $(CF_{3})$. Co-deposition of electrons roughly doubled the amount of ${CF_{3}}^{+}$ isolated in the neon matrix, although with similar enhancements of the neutralization product. While counter-ions were indirectly observed during these experiments, spectroscopic assignment of the charge carrier(s) could not be made. In experiments where ${CO_{2}}^{+}$ generated from $CO_{2}$ was trapped, absorptions attributable to ${CO_{2}}^{-}$ and $$(CO_{2})_{2}}^{-}$ were also $observed^{1}$. The addition of excess $CO_{2}$ to the system has allowed the issue of matrix neutrality to be addressed. When a mixture of $1000:1 Ne:CO_{2}$ is used as the matrix host, ${CO_{2}}^{-}$ and ${(CO_{2})_{2}}^{-}$ are also observed when other cations such as ${CF_{3}{^{+}, C_{6}{F_{6}}^{+}$, and $C_{2}H_{3}O^{+}$ are deposited. The addition of $CO_{2}$ also enhances the concentration of cations stabilized in the matrix by a factor of $\sim 5$, while not increasing the amount of neutralization.
Description
$^{1}$ Jacox, M. E., Thompson, W. E., J. Chem. Phys. 91, 1410 (1989).
Author Institution: Michigan State University, East Lansing, MI, 48824-1322
Author Institution: Michigan State University, East Lansing, MI, 48824-1322