# FOURIER TRANSFORM MICROWAVE SPECTRUM OF THE AlC$_2$ (\ {X}$^2$A$_1$) RADICAL

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 Title: FOURIER TRANSFORM MICROWAVE SPECTRUM OF THE AlC$_2$ (\ {X}$^2$A$_1$) RADICAL Creators: Halfen, D. T.; Min, J.; Ziurys, L. M. Issue Date: 2012 Publisher: Ohio State University Abstract: The pure rotational spectrum of the AlC$_2$ (\~{X}$^2$A$_1$) radical in the range 4 - 60 GHz has been measured using Fourier transform microwave (FTMW) methods. The species was produced using the Discharge Assisted Laser Ablation Source (DALAS) technique in a supersonic jet expansion of aluminum vapor and CH$_4$, diluted in argon carrier gas. The N = 1 $\rightarrow$ 0 and 2 $\rightarrow$ 1 transitions have been measured near 22 and 44 GHz, each exhibiting fine structure and hyperfine splittings, arising from the nuclear spin of aluminum, I($^{27}$Al) = 5/2. The higher frequency transition was recorded using a newly constructed U-band FTMW system operating at 40 - 60 GHz. The data have been analyzed with a case (b) asymmetric top Hamiltonian, and rotational, fine structure, and hyperfine constants have been determined. Measurements of the $^{13}$C isotopologues are currently underway to establish a precise structure for AlC$_2$. Description: Author Institution: Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona, Tucson, AZ 85721 URI: http://hdl.handle.net/1811/52359 Other Identifiers: 2012-FC-02