Abstract
Pure rotational spectra of NaCCH ( X ̃ 1 Σ +) and MgCCH ( X ̃ 2 Σ +) have been recorded in their ground state and v 5 vibrational level, the metal–C–C bend, in the range 315–525 GHz using millimeter-wave direct absorption techniques. This data set complements previous measurements. For NaCCH, rotational transitions were recorded for v 5 l =0 0, 1 1, 2 2, 2 0, 3 3, and 4 4 levels, and for the 0 0 states of NaCCD and Na 13 CCH . Transitions originating in the 1 1, 2 0, and 2 2 states of MgCCH were additionally observed. Rotational, l-type doubling, and vibration–rotation parameters have been determined for both species, as well as estimates of the ω 5 bending frequency.
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