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 Title: Excited State Spectroscopy of Diatomic Argon Author(s): Herring, Cyrus McNeely Doctoral Committee Chair(s): Eden, J.G. Department / Program: Electrical Engineering Discipline: Electrical Engineering Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Chemistry, Physical Abstract: Laser-induced fluorescence spectra for the $7p\sigma\ \sp3\Sigma\sbsp{g}{+}\gets a\ \sp3\Sigma\sbsp{u}{+}$ transition have led to the first resolved triplet splittings and rotational analyses for Rydberg-Rydberg transitions in Ar$\sb2.$ Analyses for the (0-0), (0-1), (1-0), and (1-1) bands of $7p\sigma\gets a$ are presented here. Bands with $\rm v\sp\prime=2$ are observed for this system but exhibit no rotational structure and bands with $\rm v\sp\prime>2$ are not observed, indicating that the predissociation lifetimes of these upper levels fall rapidly for $\rm v\sp\prime>1.$ Data presented lead to rotational energies and molecular constants for the $a\ \sp3\Sigma\sbsp{u}{+}$ and $7p\sigma\ \sp3\Sigma\sbsp{g}{+}$ states, including the effective rotational constant $B\sb{e},$ which is determined to be 0.1412 cm$\sp{-1}$ and 0.1345 cm$\sp{-1}$ for the $4s\sigma\ a\ \sp3\Sigma\sbsp{u}{+}$ and $7p\sigma\ \sp3\Sigma\sbsp{g}{+}$ states, respectively. Results are compared to ab initio and other calculations, and combined with existing data to produce experimental estimates of $D\sb0$ and $D\sb{e}$ for the $a\ \sp3\Sigma\sbsp{u}{+}$ state of 5700 $\pm$ 200 cm$\sp{-1}$ and 5850 $\pm$ 200 cm$\sp{-1},$ respectively. Issue Date: 1998 Type: Text Language: English Description: 78 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998. URI: http://hdl.handle.net/2142/81225 Other Identifier(s): (MiAaPQ)AAI9834688 Date Available in IDEALS: 2015-09-25 Date Deposited: 1998
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