LASER SPECTROSCOPIC CHARACTERIZATION OF THE GROUND $\tilde{X}{^{1}}\Sigma^{+}_{g}$ AND EXCITED $\tilde{A} {^{1}}B_{1}$ STATES OF JET-COOLED LIOLI (``LITHIATED WATER'')
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Date
2002
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Publisher
Ohio State University
Abstract
Various laser based spectroscopies, including R2PI (Resonance Two-Photon Ionization), LIF (Laser-induced Fluorescence), DF (Dispersed Fluorescence), and SEP (Stimulated Emission Pumping) have been utilized to determine several vibrational and rotational constants for the ground ($\tilde{X} {^{1}}\Sigma^{+}_{g}$) and first singlet excited state ($\tilde{A} ^{1}B_{1})$ of $^{7}Li^{16}O^{7}Li$. From analysis of SEP spectra to ($\nu_{1}, \nu^{\ell}_{2}, \nu_{3} = 0$) vibrational states, the $^{7}Li^{16}O^{7}Li$ ground state is confirmed to be linear, with a bond length ($R_{0}$) of $1.611 \pm 0.005$ {\AA}. The $^{1}B_{1}$ excited state is bent, with a bond angle of approximately $105^{\circ}$, and a bond length ($R_{0}$) of approximately 1.84 {\AA}. These geometries are consistent with ab initio estimates, and with the idea that the bonding in both these states is essentially ionic ($Li^{+1}O^{-2}Li^{+1}$ and $Li^{+1/2}O^{-1}Li^{+1/2}$, respectively).
Description
Author Institution: Department of Chemistry, University of Utah