# DOUBLET-QUARTET ANTICROSSINGS IN CN

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 Title: DOUBLET-QUARTET ANTICROSSINGS IN CN Creators: Miller, Terry A.; Freund, Robert S. Issue Date: 1976 Publisher: Ohio State University Abstract: The CN radical is one of the most studied molecules. Nine doublet states of the molecule are known from optical spectroscopy. No direct observation of a quartet state has ever been made; however, recent experiments by Coxon, Ramsay, and $Setser^{1}$ strongly indicate that a quartet state is responsible for the perturbation of the N = 20, v = 11 levels of the $B^{2}\Sigma^{+}$ state. Recent experiments by ourselves have shown the power of the anticrossing method for the study of the forbidden singlet-triplet spectroscopy of $H_{2}, D_{2}$ and $He_{2}$. Using the Ar metastable method for producing CN we have performed an anticrossing experiment on the N = 20, v = 11 level of $B^{2}\Sigma^{+} + CN$. Strong, structured increases in optical emission as a function of magnetic field have been observed. These are interpreted as due to the magnetically tuned anticrossings between first the $M_{S} = 3/2$ and then $M_{s} = 1/2$ levels of the quartet state with the two rho doublets of the N = 20 level of the $B^{2}\Sigma^{+}$ state. The basic anticrossing structure is rather broad but superimposed upon it are quite narrow lines ($< 20$ gauss) which we tentatively attribute to forbidden anticrossings. Details will be presented concerning the doublet-quartet zero field splitting, spin splitting in the quartet, etc. Description: $^{1}$ T. Nakagawa and J. Overend, J. Mol. Spectrosc. 50, 333 (1974). Author Institution: Bell Laboratories URI: http://hdl.handle.net/1811/9865 Other Identifiers: 1976-TN-2