Microwave Spectrum and Structure Determination of the CCAs Radical (X^2Π_r)

Details Microwave Spectrum and Structure Determination of the CCAs Radical (X^2Π_r) Microwave Spectrum and Structure Determination of the CCAs Radical (X^2Π_r)

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confefc07s&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

Computer Science

Microwave

Scientific paper

The microwave spectrum of the CCAs radical (X^2Π_r) has been measured using Fourier transform (FTMW) techniques. This species were created in a supersonic expansion by the reaction of arsenic trichloride, AsCl_3, and acetylene, C_2H_2, diluted in argon carrier gas, using a pulsed nozzle coupled with a DC discharge. Three rotational transitions of CCAs were measured in the frequency range of 12 to 32 GHz, in which both lambda-doubling and hyperfine interactions were observed, the latter due to the arsenic spin of I = 3/2. In addition, four rotational transitions for ^{13}C^{13}CAs were measured in the frequency range of 11 to 38 GHz, as well as several transitions arising from ^{13}C^{12}CAs and ^{12}C^{13}CAs. In these three species, hyperfine splittings were also observed due to the ^{13}C nuclei, creating complex patterns for these isotopologues. These data were analyzed with a Hamiltonian incorporating the appropriate number of nuclear spins, and effective rotational, lambda-doubling, and arsenic and carbon-13 hyperfine constants were determined. From the effective rotational constants, bond lengths for this linear species have been established. The distribution of electrons in this radical has also been inferred from the hyperfine constants.

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