Abstract
The rotational spectrum of trichloroethylene was assigned through the analysis of bands formed in the mm-wave region from high-JbRtransitions. Accurate sextic level spectroscopic constants are reported for the common isotopic species, the three singly37Cl substituted species, the three doubly37Cl substituted species, and the four lowest lying vibrational states of the common species. The molecular structure for trichloroethylene is reported and compared withab initiocalculations. A new kind of extendedR-type band, which arises from rotor properties at the prolate symmetric-top limit, was observed; its general properties are determined and compared with those of other known pure-rotationalR-type bands.
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