SPECTROSCOPY OF DIPOLE BOUND ANIONS
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Date
2002
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Ohio State University
Abstract
Any molecule with a dipole moment above about 2.5 Debye can form a dipole bound anion. These anions are best produced by charge exchange from atoms in high Rydberg states (Rydberg electron transfer, RET)$^{a}$. Binding energies (electron affinities, EAs) are estimated from the narrow range of principal quantum number $n^{\ast}_{RET}$ at which charge exchange occurs or from measurements of the electric field $(E_{critical})$ required to detach the electron. In one instance (3-methylcyclohexanone) we observe two bound dipole states (3.3 meV and 8.8 meV). An isotope effect in the binding energies of acetone-h (2.92 meV) and acetone-d (2.61 meV) is observed in both $n^{\ast}_{RET}$ and $E_{critical}$. Presently, we are studying photodetachment electron spectroscopy of these anions in order to obtain direct values of EA and to access higher excited valence bound anions.
Description
$^{a}$R. N. Compton and N. I. Hammer ``Multipole-Bound Molecular Anions'' in Advances in Gas-Phase Ion Chemistry 4, edited by N. Adams and L. Babcock, Elsevier Science, 2001.
Author Institution: Departments of Chemistry and Physics, Buehler Hall, University of Tennessee
Author Institution: Departments of Chemistry and Physics, Buehler Hall, University of Tennessee