ROTATIONAL AND HYPERFINE ANALYSIS OF THE $a^{1}\Delta_{g}$$\leftarrow$$X^{3}\Sigma^{-}_{g}$ BAND OF $^{17}$O-CONTAINING ISOTOPOLOGUES OF OXYGEN MEASURED BY CRDS AT ROOM AND LIQUID NITROGEN TEMPERATURES
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Date
2011
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Ohio State University
Abstract
The $a^{1}\Delta_{g}$$\leftarrow$$X^{3}\Sigma^{-}_{g}$ system of the $^{16}$O$^{17}$O, $^{17}$O$^{18}$O and $^{17}$O$_{2}$ isotopologues of oxygen was studied by high sensitivity CW-Cavity Ring Down Spectroscopy. The spectra of a $^{17}$O highly enriched sample were recorded at room temperature between 7640 and 7917 \wn~and at liquid nitrogen temperature in the 7876-7893 \wn~ region. The magnetic dipole (0-0) band was observed for all three $^{17}$O-containing isotopologues. At liquid nitrogen temperature some of the transitions were observed with partially resolved hyperfine splitting due to the $^{17}$O nuclear spin, allowing determination of the hyperfine constants. The electric quadrupole (0-0) band and the (1-1) magnetic dipole hot band were also observed for the $^{16}$O$^{17}$O and $^{17}$O$_{2}$ species. The rotational and hyperfine spectroscopic parameters of the $X^{3}\Sigma^{-}_{g}$ and $a^{1}\Delta_{g}$ states of the three studied isotopologues were derived from global fit of the measured line positions and microwave and Raman measurements available in the literature. The rotational constants of the $a^{1}\Delta_{g}$ (v=0, 1) states of $^{17}$O$_{2}$ are determined for the first time.
Description
Author Institution: Universite de Grenoble, CNRS UMR 5588, LIPHY, 38041 Grenoble, France; Harvard-Smithsonian Center for Astrophysics, Atomic and Molecular; Physics Division, Cambridge MA 02138-1516, USA; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA; Universite de Grenoble, CNRS UMR 5588, LIPHY, 38041 Grenoble, France