STUDY OF LOW-LYING RYDBERG STATES IN $O_{2}$ BY ELECTRON-IMPACT SPECTROSCOPY
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Date
1972
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Publisher
Ohio State University
Abstract
There has been considerable work done on the photo-absorption spectrum of $O_{2}$ in the 6 to 12 eV region but only very few of the Rydberg states in that region have been identified. The energy-loss region from 6 to 10.5 eV has been studied as a function of incident energy and of scattering angle. The angle and energy dependence observed for the various features in the energy-loss spectra were correlated with the known behavior for transitions of certain symmetry and with the results of improved-virtual-orbital calculations. This analysis has resulted in the identification of the low-lying $(^{1}\Pi_{g} \rightarrow 3_{SC_{g}}) ^{3}{\Pi}_{g}$ Rydberg state. The lowest four vibrational levels were observed superposed on the top of the maximum intensity portion of the Schumann-Runge continuum and the state was located at $T_{00} = 8.13 {\pm} 0.02 $eV. The analysis has also resulted in the following tentative identifications for Rydberg states excited from the $^{1}{\Pi}_{g}$ MO: $^{1}{\Sigma}^{-}_{u} at ~ 9.76 \ $eV, $^{3}{\Sigma}^{+}_{u}$ at 9.94 eV, and the ``longest band’’ at 9.97 eV as a $^{3}{\Sigma}^{-}_{u}$.
Description
Author Institution: Aerospace Corporation; California Institute of Technology; Jet Propulsion Laboratory Pasadena