Fine structure and dipole moment of metastable a3∏ carbon monoxide

Richard C. Stern, Richakd H. Gammon, Michael E. Lesk, Robert S. Freund, William A. Klemperer

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The radio-frequency spectrum of the first four (v = 0.3) vibrational states of the a3∏ metastable state of 12C16O has been measured in molecular beam electric resonance from 0 to 500 MHz. Lambda doubling transitions have been observed in / = 2-7 of Ω = 2, and in J = 1 and 2 of Ω= 1 at zero electric and magnetic field and as a function of electric field. An exhaustive reanalysis of a 3∏ optical data is presented, in which the spin-orbit, rotational, spin-spin dipole-dipole, and potential-energy parameters have been accurately determined. Together with parameters determined from the rf spectrum, the resulting set of fine structure parameters predicts the complete lambda doubling spectrum to better than l in 104 for J=0-50, v = 0-3. The predicted frequencies below 5 GHz are tabulated for possible radio-astronomical measurement of a 3II CO.The Stark effect allows the a 3II dipole moment to be determined to an absolute accuracy of 2 in 104, and the small dependence upon spin-orbit, vibrational, and rotational state has been accurately measured.

Original languageEnglish (US)
Pages (from-to)3467-3482
Number of pages16
JournalThe Journal of Chemical Physics
Issue number7
StatePublished - 1970
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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