THE MICROWAVE SPECTRUM OF 1,2,4-TRIAZINE AND THE ROTATIONAL CONSTANT OBTAINED FROM A SIMULTANEOUS ANALYSIS OF MICROWAVE GROUND STATE AND HIGH RESOLUTION IR-TRANSITIONS.

$^{a}$ Palmer, Maier, Hegelund, and Newnham, J. Mol. Spectrossc. 192, 331, (1998)and Bach, Hegelund, Beukes, Nicolaisen, and Palmer, J. Mol, Spectrose. 198, (1999)Author Institution: Institute of Physical and Theoretical Chemistry, University of T\""ubingen; Department of Chemistry, University of Edinburgh; Department of Chemistry, Aarhus UniversityThe microwave spectrum of 1,2.4-triazine has been recorded in the Ku- and Ka-bands using a conventional stark spectrometer. The low -J lines appeared close to the frequencies predicted for the ground state from the high resolution $FTIR-studies^{a}$, but to secure a correct assignment of higher J Q-branch transitions a microwave microwave double resonance experiment was done for a few of transitions sharing a common level. 145 transitions were recorded with $J_{max}=42$, $K_{a,max} =33$, and $K_{e,max} =11$. A simultaneous fit to MW pure rotational transitions and to the rotational structure of selected IR-bands led to a determination of rotational and all 5 quartic centrifugal distortion constants

Abstracts of the 6th FECS Conference 1998 Lectures

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