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Journal of Chemical Physics / Volume 129 / Issue 13 / ARTICLES / Gas Phase Dynamics and Structure: Spectroscopy, Molecular Interactions, Scattering, and Photochemistry

J. Chem. Phys. 129, 134303 (2008); http://dx.doi.org/10.1063/1.2982783 (7 pages)

Millimeter-wave spectroscopy of CoNO Produced by UV laser photolysis of Co(CO)3NO

Ai Sakamoto, Masato Hayashi, Kensuke Harada, Takehiko Tanaka, and Keiichi Tanaka

Department of Chemistry, Faculty of Sciences, Kyushu University, Hakozaki, Higashiku, Fukuoka 812-8581, Japan

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(Received 21 May 2008; accepted 25 August 2008; published online 2 October 2008)

The rotational spectrum of cobalt mononitrosyl (CoNO) produced by ultraviolet photolysis of Co(CO)3NO 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, ν1, ν2, ν3, and 2ν2 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 1Σ+ symmetry. The rotational lines in the 2ν2(Σ) and ν3 states were observed to be perturbed by Fermi resonance. The equilibrium rotational constant Be is determined to be 4682.207(15) MHz. The CoN bond length is derived to be 1.5842 Å assuming the NO bond length of 1.1823 Å. A large nuclear spin-rotation interaction constant, CI = 123.8(11) kHz, was determined, suggesting a 1Π electronic excited state lying close to the ground state.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL
  3. OBSERVED SPECTRUM
  4. ANALYSIS
  5. DISCUSSION
  6. CONCLUSION

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KEYWORDS and PACS

Keywords

bond lengths, cobalt compounds, excited states, Fermi resonance, ground states, hyperfine interactions, laser materials processing, photolysis, spin-rotation coupling, vibrational modes

PACS

  • 82.50.Hp

    Processes caused by visible and UV light

  • 71.70.Jp

    Nuclear states and interactions

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2982783

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    K. Tanaka, M. Shirasaka, and T. Tanaka, J. Chem. Phys. 106, 6820 (1997)JCPSA6000106000017006820000001.

    K. Tanaka, M. Toshimitsu, K. Harada, and T. Tanaka, J. Chem. Phys. 120, 3604 (2004)JCPSA6000120000008003604000001.

    T. Okabayashi, E. Yamazaki, and M. Tanimoto, J. Chem. Phys. 111, 3012 (1999)JCPSA6000111000007003012000001.

    L. H. Jones, R. S. McDowell, and B. I. Swanson, J. Chem. Phys. 58, 3757 (1973)JCPSA6000058000009003757000001.

    F. DeLucia and W. Gordy, Phys. Rev. 187, 58 (1969).

    K. C. Namiki and S. Saito, J. Chem. Phys. 114, 9390 (2001)JCPSA6000114000021009390000001.


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