Submillimetre-wave spectrum of diacetylene and diacetylene-d2
Résumé
Rovibrational bands between closely lying bending vibrational states of normal diacetylene and its bideuterated variant have been recorded in the submillimetre-wave region using a source-modulation spectrometer. The two isotopologues were produced by pyrolysis (1200°) of benzene or benzene-d6 vapour in a flow reactor. Measurements of the nu_8 - nu_6 band and of its nu_9 associated hot band have been extended up to 615 GHz and 420 GHz, respectively. Rotational and vibrational l-type resonance were taken into account in the analysis of the nu_8 + nu_9 - nu_6 - nu_9 band; in addition the cubic anharmonic resonance existing between the v_8=v_9=1 state and the v_3=1 stretching state has been considered explicitly in the least-squares fits to the observed frequencies. Very accurate values of the band origins and of numerous spectroscopic constants have been determined for both isotopologues.
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