dc.creator Slanger, T. G. en_US dc.creator Huestis, D. L. en_US dc.date.accessioned 2006-06-15T14:36:10Z dc.date.available 2006-06-15T14:36:10Z dc.date.issued 1980 en_US dc.identifier 1980-TG-6 en_US dc.identifier.uri http://hdl.handle.net/1811/11418 dc.description Author Institution: en_US dc.description.abstract Until recently, studies of the three $O_{2}$ metastable states lying 4 to 5 eV above the ground state have been of a quite limited nature. The $A^{3}\Sigma_{u}^{+} \rightarrow X^{3}\Sigma_{g}^{-}$ transition is known both in laboratory afterglow sources and in the terrestrial nightglow, but investigation of the $c^{1}\Sigma_{u}^{-}$ and $A^{\prime}\ ^{3}\Delta_{u}$ states has been nearly dormant since Herzberg’s absorption measurements of 27 years ago. It is now clear that all three states are produced by O-atom recombination. Under proper afterglow conditions, the $c^{1}\Sigma_{u}^{-} \rightarrow X^{3}\Sigma_{g}^{-}, c^{1}\Sigma_{u}^{-} \rightarrow a^{1}\Delta_{g}$, $A^{\prime} {^{3}\Delta_{u}^{-}} \rightarrow X^{3}\Sigma_{g}^{-}$, and $A^{\prime} {^{3}\Delta_{u}} \rightarrow a^{1}\Delta_{g}$ emission band systems are all easily observed, providing valuable spectroscopic information. The c-X bands are prominent in the Venus nightglow spectrum. We have now confirmed that the $A^{\prime}-a$ bands are distinct terrestrial nightglow features. By calculating a synthetic emission spectrum we are able to match the observed 3000-4500 {\AA} terrestrial nightglow spectrum only if we include bands from the c-X system, in addition to the previously identified A-X and $A^{\prime}-a$ bands. All three upper states emit exclusively from high vibrational levels. In contrast the $c^{1}\Sigma_{u}^{-}$ state in the Venus atmosphere is seen only from $v^{\prime}=0$. The emissions from $A^{\prime}$ and c states account for 25-30%. of the 2500-4500 {\AA} terrestrial nightglow, implying that these states are much more important than was previously suspected. en_US dc.format.extent 134409 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE $A^{3}\Sigma_{u}^{+}, A'\ ^{3}\Delta_{u}$, AND $c^{1}\Sigma_{u}^{-}$ STATES OF $O_{2}$ IN THE LABORATORY AND IN PLANETARY AIRGLOWS en_US dc.type article en_US
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