Rotational spectrum, structure, and electric dipole moment of bis(difluoromethyl) ether

The rotational spectrum of bis(difluoromethyl) ether (CF2HOCF2H) has been o bserved and analyzed using both a conventional Stark-modulated microwave sp ectrometer and a pulsed molecular beam Fabry-Perot cavity microwave (FTMW) spectrometer. The lowest energy conformer studied here has a (hydrogen) syn -anti conformation. The high sensitivity of the FTMW spectrometer permits o bservation and analysis of the C-13, O-18 and H-2 isotopomers in natural ab undance. The electric dipole moment was measured for the normal species and found to be mu(a), = 5.020(7) x 10(-30) C.m [1.505(2) D], mu(b) = 0.19(4) x 10(-30) C.m [0.056(11) D], mu(c) = 0.48(2) x 10(-30) C.m [0.144(7) D], an d mu(T) = 5.047(10) x 10(-30) C.m [1.513(3) D].