Abstract
High precision rotational spectra of isotopic oxygen O 2 (with O 16 or O 18 ) in its Σ g − 3 electronic ground state have been measured in selected frequency regions between 0.4 and 2.0 THz. The main isotopic species, O 2 16 , was also investigated in its first excited electronic state Δ 1 . The new data, analyzed together with previous measurements, yielded improved spectroscopic parameters.
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