Abstract
Rotational transitions of the ternary van der Waals complex NeArCO2 were measured with a pulsed molecular beam cavity Fourier transform microwave spectrometer. Six isotopomers, namely 20Ne40Ar12C16O2, 22Ne40Ar12C16O2, 20Ne40Ar17O12C16O, 20Ne40Ar13C16O2, 22Ne40Ar13C16O2 and 20Ne40Ar18O13C16O, were investigated. Both a- and b-type transitions were observed in the frequency range from 4.0GHz to 19.0GHz. Structural information from the rotational constants indicates that the three dimer subunits are only slightly modified upon formation of the trimer system. It was possible to resolve hyperfine structure due to the nuclear electric quadrupole moment of 17O in rotational transitions of 20Ne40Ar17O12C16O. The resulting nuclear quadrupole coupling constants χaa, χbb and χcc were used to obtain information about the extent of intermolecular vibrational motions within the complex. During the spectral search, previously unassigned transitions of minor isotopomers of NeCO2, ArCO2 and Ar2CO2, were found. For Ar2CO2, ь-type rotational transitions of two 2 2 2 2 minor isotopomers with 13C16O2 and 18O13C16O were recorded and analysed, and are reported in this paper.
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