Excited State Spectroscopy of Diatomic Argon

Herring, Cyrus McNeely

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https://hdl.handle.net/2142/81225 Copy

Description

Title

Excited State Spectroscopy of Diatomic Argon

Author(s)

Herring, Cyrus McNeely

Issue Date

1998

Doctoral Committee Chair(s)

Eden, J.G.

Department of Study

Electrical Engineering

Discipline

Electrical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Chemistry, Physical

Language

eng

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.

Graduation Semester

1998

Type of Resource

text

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http://hdl.handle.net/2142/81225

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