Examples of electronic states described by van Vleck as " pure precession " are found in the Hg, Cd and Zn halide spectra and also with InO and GaO. These are shown to be in close resonance and probably have abnormally large Δ-type doubling. An interpretation of the spectra of InO and GaO is given and a potential-energy diagram is presented for these molecules and also for TlO.
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H. G. Howell (1945) studied this question.
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