LABORATORY DETECTION AND MICROWAVE SPECTRUM of ScC$_2$ RADICAL (X$^2$A$_1$)
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Date
2012
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Publisher
Ohio State University
Abstract
The pure rotational spectrum of ScC$_2$ (X$^2$A$_1$) has been measured using Fourier transform microwave (FTMW) spectroscopy. This is the first study of ScC$_2$ by any spectroscopic technique. In the FTMW system, the molecule was synthesized using the discharge assisted laser ablation source (DALAS) from a mixture of 0.25 \% methane in argon and the ablation of a scandium rod. Spectra of the main isotopologue, ScC$_2$, as well as Sc$^{13}$C$^{13}$C and Sc$^{13}$C$^{12}$C, have been recorded in the frequency range of 4-60 GHz. Three rotational transitions have been measured, each exhibiting fine structure and hyperfine splittings due to scandium nuclear spin ($I$ =7/2). The data have been analyzed with a $^2$A$_1$ Hamiltonian and rotational, spin-rotation constants and Sc and $^{13}$C hyperfine parameters have been determined. The spectra are consistent with a triangular structure and a $^2$A$_1$ ground electronic state as predicted by theory. A precise structure will be presented.
Description
Author Institution: Department of Chemistry and Biochemistry, Department of Astronomy, and Steward Observatory, University of Arizona, Tucson, AZ 85721