Laser induced fluorescence spectroscopy of jet-cooled caoca

Sullivan, Michael N.

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https://hdl.handle.net/2142/91479 Copy

Description

Title

Laser induced fluorescence spectroscopy of jet-cooled caoca

Author(s)

Sullivan, Michael N.

Contributor(s)

• Fawzy, Wafaa M.
• Heaven, Michael
• Frohman, Daniel J.

Issue Date

2016-06-23

Keyword(s)

Metal containing

Abstract

The group IIA metals have stable hypermetallic oxides of the general form MOM. Theoretical interest in these species is associated with the multi-reference character of the ground states. It is now established that the ground states can be formally assigned to the $\mathrm{M^{+}O^{2-}M^{+}}$ configuration, which leaves two electrons in orbitals that are primarily metal-centered $ns$ orbitals. Hence the MOM species are diradicals with very small energy spacings between the lowest energy singlet and triplet states. Previously, we have characterized the lowest energy singlet transition ($\mathrm{^{1}\Sigma^{+}_{u}\leftarrow X^{1}\Sigma^{+}_{g}}$) of BeOBe. In this study we obtained the first electronic spectrum of CaOCa. Jet-cooled laser induced fluorescence spectra were recorded for multiple bands that occured within the 14,800 - 15,900 $\mathrm{cm^{-1}}$ region. Most of the bands exhibited simple P/R branch rotational line patterns that were blue-shaded. Only even rotational levels were observed, consistent with the expected X $\mathrm{^{1}\Sigma^{+}_{g}}$ symmetry of the ground state ($\mathrm{^{40}Ca}$ has zero nuclear spin). A progression of excited bending modes was evident in the spectrum, indicating that the transition is to an upper state that has a bent equilibrium geometry. Molecular constants were extracted from the rovibronic bands using PGOPHER. The experimental results and interpretation of the spectrum, which was guided by the predictions of electronic structure calculation, will be presented.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

En

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http://hdl.handle.net/2142/91479

Copyright and License Information

Copyright 2016 by the authors

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