DISPERSED FLUORESCENCE SPECTROSCOPY OF PdC: ASSIGNMENT OF THE $^{1}\Sigma^{+}$ GROUND STATE AND OBSERVATION OF LOW-LYING STATES
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Date
1999
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Ohio State University
Abstract
Dispersed fluorescence spectroscopy of PdC in a supersonic expansion has led to the observation of five electronic states. These include the $12\sigma^{2}, ^{1}\Sigma^{+}$ ground state and the set of four $12\sigma^{1}6\pi^{1}, ^{3}\Pi_{\Omega}$ states. Previous studies in this $laboratory^{a}$ had determined the ground state to be $\Omega-0$; however, the dispersed fluorescence data presented here leads to the assignment of the ground state as $^{1}\Sigma^{+}$. Vibrational progressions have also been observed in the $12\sigma^{2}, ^{1}\Sigma^{+}$; and $12\sigma^{1}6\pi^{1}, ^{3}\Pi_{0+}$ states. These give $\omega_{e}{^{\prime\prime}}$ values of $850.46\pm 3.55 cm^{-1}$ and $788.38\pm 5.35 cm^{-1}$, respectively. The previously observed $[17.9]\Omega=1 state^{e}$ is also identified as the $12\sigma^{1}13\sigma^{1},^{3}\Sigma_{1}{^{+}}$ state. Together with the dispersed fluorescence studies of $MoC^{b}$ and $RuC^{e}$, results from work on PdC are combined with characteristics of other carbides to illustrate relationships and trends between electronic configuration, ground state and low-lying state symmetry, and vibrational frequency.
Description
$^{a}$ J.D. Langenberg, L. Shao, and M.D. Morse, in preparation. $^{b}$ R.S. DaBell, R.G. Meyer, and M.D. Morse, presented at this Symposium. $^{c}$ R.S. DaBelt and M.D. Morse, presented at this Symposium.
Author Institution: Department of Chemistry, University of Utah
Author Institution: Department of Chemistry, University of Utah