AI Article Synopsis
- Researchers observed the rotational spectrum of cobalt mononitrosyl (CoNO) in the millimeter-wave range, confirming its linear structure and (1)Sigma(+) electronic ground state.
- Seven rotational transitions were detected in a supersonic jet, alongside additional transitions in different vibrational states measured using a free-space absorption cell.
- The study revealed the CoN bond length to be 1.5842 Å and found a significant nuclear spin-rotation interaction constant, indicating the presence of a (1)Pi electronic excited state near the ground state.
Article Abstract
The rotational spectrum of cobalt mononitrosyl (CoNO) produced by ultraviolet photolysis of Co(CO)(3)NO was observed in the millimeter-wave region. Seven rotational transitions in the ground state ranging from J = 6-5 to 12-11, with hyperfine splittings due to the Co nucleus (I = 7/2), were detected in a supersonic jet environment, while higher-frequency transitions in the range from J = 29-28 to 35-34 were measured in the ground, nu(1), nu(2), nu(3), and 2nu(2) vibrational states using a free-space absorption cell. It was confirmed from the observed spectral pattern that the CoNO molecule has a linear structure with the electronic ground state of (1)Sigma(+) symmetry. The rotational lines in the 2nu(2)(Sigma) and nu(3) states were observed to be perturbed by Fermi resonance. The equilibrium rotational constant B(e) is determined to be 4682.207(15) MHz. The CoN bond length is derived to be 1.5842 A assuming the NO bond length of 1.1823 A. A large nuclear spin-rotation interaction constant, C(I) = 123.8(11) kHz, was determined, suggesting a (1)Pi electronic excited state lying close to the ground state.
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| http://dx.doi.org/10.1063/1.2982783 | DOI Listing |
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