Dipole moments of eight molecules were determined by the Stark splittings of the rotational transitions in the microwave region. The molecules and their moments in Debye units are: As${\mathrm{F}}_3$, 2.815±0.025; C${\mathrm{H}}_3$I, 1.647±0.014; C${\mathrm{H}}_3$Cl, 1.869±0.010; C${\mathrm{H}}_3$Br, 1.797±0.015; C${\mathrm{H}}_3$C${\mathrm{F}}_3$, 2.321±0.034; P${\mathrm{F}}_3$, 1.025±0.009; ${\mathrm{N}}_2$O, 0.166±0.002; and ClCN, 2.802±0.020. In all cases Stark effects followed very closely theoretical expectations.

• Received 30 December 1948

DOI:https://doi.org/10.1103/PhysRev.78.145