Rotational spectra of 1-chloro-2-fluoroethylene. I. Main isotopologues and deuterated species of the trans isomer

Guided by theoretical predictions, the rotational spectra of the mono- and bideuterated species of trans-1-chloro-2-fluoroethylene, CH(35)Cl=CDF, CH(37)Cl=CDF, CD(35)Cl=CHF, CD(37)Cl=CHF, CD(35)Cl=CDF, and CD(37)Cl=CDF, have been recorded for the first time. Assignment of the DeltaJ=0 and DeltaK(-1)=+1 bands with K(-1)=3,4,5,... (all isotopic species) as well as of several DeltaJ=+/-1, DeltaK(-1)=+1 transitions (all isotopic species except CH(37)Cl=CDF, CD(37)Cl=CHF and CD(37)Cl=CDF) led to the accurate determination of the ground-state rotational constants, the quartic and some sextic centrifugal distortion constants, as well as the nuclear quadrupole coupling constants for both (35)Cl and (37)Cl in good agreement with corresponding theoretical predictions based on high-level coupled-cluster calculations. Inconsistencies of the present spectroscopic parameters with respect to those reported earlier for the two main isotopologues, i.e., CH$(35)Cl=CHF and CH(37)Cl=CHF, necessitated a reinvestigation of the rotational spectra for these two isotopic species. Supported by quantum chemical calculations, the previously recorded spectra are reassigned to a vibrationally excited state, while analysis of the DeltaJ=0 and DeltaK(-1)=+1 as well as some DeltaJ=+/-1, DeltaK(-1)=+1 transitions provided a revised set of spectroscopic parameters for the vibrational ground state of these two isotopic species.