A portion of the J = 35 ← 34 ground vibrational state aR-transitions of the rotational spectrum of CH3CH=C=CH-CN taken at a Stark field of 50 V/cm. The intensity (y-axis) is in arbitrary units. The transitions have positive amplitudes, whereas the Stark lobes have negative amplitudes. The numbers above the assigned peaks refer to the K-1 pseudo quantum number. The unlabeled and most intense line to the extreme left consists of the unresolved K-1 = 6 and 8 transitions. The line corresponding to K-1 = 17 is overlapped by an excited state transition as well as by Stark lobes. The minor lines presumably belong to vibrationally excited states. Stark lobes interfere with the other lines to a very minor degree, but are not completely absent.
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