ROTATIONAL SPECTRA OF JET-COOLED ION COMPLEXES
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Date
1996
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Ohio State University
Abstract
Microwave spectra of complexes bearing molecular ions. $Ar-D_{3}^{+}/HD_{2}^{+}$ and $Ar-HCO_{4}^{+}$ were explored in a jetcooled condition. The ionic complexs were formed by a pulsed electric discharge in a supersonic expansion. Their transitions were observed in the centimeter-wave region (7-40 GHz) with a Fourier-transform microwave spectrometer, guided by the previous millimeter-wave study in a static $cell^{a}$ or the recent infrared photodissociation study in a mass-selected ion $beam.^{b}$ For $Ar-HCO^{+}$, rotational transitions of mono-substituted species on H. C. and O were also measured. The isotope substitution has confirmed the linear $Ar\ldots H-C-O$ configuration with the Ar...H distance of 2.13 \AA. The centrifugal-distoration constant for $Ar-HCO^{-}$ is two order of magnitude smaller than that for Ar-HCN. indicating much stronger binding in the ionic complex than the isoelectronic neutral counterpart.
Description
$^{a}$M. Bogey. H. Bolvin. C. Demuynck and J. L. Destombes, Phys. Rev. Lett. 58, 988 (1987) $^{b}$S. A. Nizkorodov, O. Dopfer, T. Ruchi, M. Meuwly, J. P. Maier, and E. J. Bieske, J. Phys. Chem. 99 17118 (1995).
Author Institution: Department of Chemistry, Graduate School of Science
Author Institution: Department of Chemistry, Graduate School of Science