# A COUPLED-CHANNEL CALCULATION OF THE $B\, ^3\Sigma_u^- - X\, ^3\Sigma_g^-$ SPECTRUM OF S$_2$

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 Title: A COUPLED-CHANNEL CALCULATION OF THE $B\, ^3\Sigma_u^- - X\, ^3\Sigma_g^-$ SPECTRUM OF S$_2$ Creators: Gibson, S. T.; Cavanagh, S. J.; Lewis, B. R.; Stark, G. Issue Date: 2006 Publisher: Ohio State University Abstract: \setlength{\intextsep}{0pt} \begin{wrapfigure}{r}{.55\textwidth} entering \includegraphics[width=0.45\textwidth,angle=0,clip,trim=0 0 0 0]{Gibson-S2CSE.eps} %aption{Calculated $B-X$ spectrum of S$_2$ illustrating the role of each electronic state.} \end{wrapfigure} Diatomic sulfur (S$_2$) has been observed in absorption, via the strong ultraviolet $B\, ^3\Sigma_u^- - X\, ^3\Sigma_g^-$ system, in the atmospheres of Jupiter and Io. However, the spectrum is not well understood. We apply a coupled-channel Schrodinger equation (CSE) model developed for the VUV $B\, ^3\Sigma_u^- - X\, ^3\Sigma_g^-$ transition of O$_2$} to the analogous S$_2$ spectrum, employing the potential curves and coupling scheme of Wheeler \emph{et al.},} as a starting point. The CSE calculations provide valuable insight into the photodissociation spectrum, defining the roles of the key predissociating electronic states and demonstrating complex interference effects that are more pronounced than for O$_2$.\\ Description: Author Institution: Research School of Physical Sciences and Engineering, The Australian; National University, Canberra ACT 0200, Australia (email: Stephen.Gibson@anu.edu.au); Physics Department, Wellesley College, Wellesley, MA 02481 URI: http://hdl.handle.net/1811/30957 Other Identifiers: 2006-RC-06