MW and MM-Wave Transitions of the N2–CO van der Waals Complex.
Yunjie Xu and Wolfgang Jäger
Department of Chemistry, University of Alberta, Edmonton AB T6G 2G2, Canada
Rotational transitions of the N2–CO van der Waals complex, including the N2– 13CO and N2– 13C 18O isotopomers, were measured using a Fourier transform microwave spectrometer and a microwave-Terahertz double resonance spectrometer. It was possible to resolve and to assign the 14N nuclear hyperfine components of the rotational transitions. The spectral analyses yielded rotational, centrifugal distortion, and 14N nuclear quadrupole coupling constants. These results, in particular the nuclear quadrupole coupling constants, shed additional light onto the complex intermolecular dynamics of this very floppy system. We were able to access a new state that was not reported in the previous infrared studies, , and will present a refined energy level diagram for the complex.