A high-resolution gas-phase spectrum of a molecular absorption band around 604 nm is assigned as due to an electronic transition of a nonlinear planar species starting from its electronic ground state. The spectrum is observed in direct absorption by cavity ringdown spectroscopy through a supersonic planar discharge through a mixture of acetylene in helium. The spectrum has a clear rotational and K-type structure. This allows an accurate determination of the B and C rotational constants and an estimate for the A rotational constant in ground and electronically excited states. The resolved spectrum of the fully deuterated species has been obtained as well. The results are compared both to the outcome of ab initio geometry optimizations and low-resolution absorption spectra in 6 K neon matrices obtained after mass-selective deposition.
High-resolution electronic spectroscopy of a nonlinear carbon chain radical
Mitsunori Araki, Harold Linnartz, Pawel Cias, Alexey Denisov, Jan Fulara, Anton Batalov, Ivan Shnitko, John P. Maier; High-resolution electronic spectroscopy of a nonlinear carbon chain radical . J. Chem. Phys. 15 June 2003; 118 (23): 10561–10565. https://doi.org/10.1063/1.1575736
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