Fourier Transform Microwave Spectrum of the FeCN Radical (X^4Δ_i) and Confirmation of the Ground Electronic State

Details Fourier Transform Microwave Spectrum of the FeCN Radical (X^4Δ_i) and Confirmation of the Ground Electronic State Fourier Transform Microwave Spectrum of the FeCN Radical (X^4Δ_i) and Confirmation of the Ground Electronic State

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confetc09h&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

Physics

Microwave

Scientific paper

The pure rotational spectrum of the FeCN radical (X^4Δ_i) has been measured using Fourier transform microwave (FTMW) techniques in the 4 - 40 GHz frequency range and a laser ablation source. The species was produced using Discharge Assisted Laser Ablation Spectroscopy (DALAS) in a supersonic jet expansion of iron vapor and (CN)_2, diluted in argon carrier gas. The fundamental rotational transition, J = 9/2 → 7/2 (Ω = 7/2), was recorded near 36 GHz. Three hyperfine transitions, due to the nitrogen nuclear spin of I = 1, were observed in the spectrum. These data were combined with the previous millimeter/submillimeter measurements of FeCN in a global fit and nitrogen hyperfine constants were determined. These measurements confirm that the ground state of FeCN is ^4Δ_i, as suggested by previous millimeter/submillimeter measurements of Flory & Ziurys. Theoretical calculations have predicted that the ground state of this radical is ^6Δ_i. In a ^6Δ_i state, the J = 9/2 → 7/2 transition does not exist in the lowest energy ladder (Ω = 9/2).

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