THE MICROWAVE SPECTRUM OF DIFLUOROMETHANIMINE. $F_{2}CNH$

Author Institution: FB 9, Anorganische Chemie, Gesamthochschule Wuppertal; Physikalisch-Chemisches Institute, Justus Liebig Universit\""{a}t.The rotational spectrum of diflouromethanimine. $F_{2}CNH$, has been observed for the first time. In the region from 16 to 40 GHz 99 strong b-type transitions belonging to the branches bR*** and bQ***, and 4 weak a-type transitions belonging to the aQ*** branch have been assigned. Most of the observed rotational lines show the effects of the nuclear quadrupole interaction due to the ***N nucleus. All assigned 103 transitions could be fitted to Watson's Hamiltonian with A-reduction in the ***-axis representation. The preliminary spectroscopic constants are: $A - 11464.021 MHz. B = 11151.888 MHz. C = 5643.140 MHz. \Delta_{k}, = 5.25 kHz, \delta, - 0.184 kHz, \delta, = 9.555 kHz, 6, = 2.175 kHz$, and $k = 5.087 kHz$. These results confirm the assumption that F2CNH is a planar oblate asymmetric rotor molecule having C*** symmetry with asymmetry parameters $k= 0.8927$ and $b = -0.02756$, respectively. Further measurements in the millimeter wave region and the analysis of the nuclear quadrupole hyperfine structure of the individual rotational lines for F2CNH will be reported at the meeting