Millimeter-wave spectrum of CF2Cl2, taking into account the hyperfine structure

A new investigation of the (CF2Cl2)-Cl-35 ground state rotational spectrum in the 50-100 GHz frequency range gave an opportunity to improve the accura cy of rotational and quartic distortion parameters by an order of magnitude and to determine values of six sextic centrifugal distortion parameters. A special technique was used to process line profiles of unresolved or parti ally resolved hyperfine structures of rotational transitions. It allowed us to improve significantly values for the diagonal parameters of quadrupole coupling chi(aa), (chi(bb)-chi(cc)) and to determine the off-diagonal param eter chi(ab). (C) 2000 Academic Press.