Knowledge Bank

The microwave spectrum of cis-1, 1, 2, 3-tetrafluorocyclopropane has been investigated in the region of 26.5 to 40.0 GHz. A rigid-rotor fit of fifteen $\mu c$ type R-branch transitions yields the rotational constants: $A=3450.37(1)MHzB=2402.81(1)MHzC=2060.21(1)MHz$ Transition frequncies were also determined for the two $K-1=12+13\mu c$ type Q-branch series from $J=13$ to $J=28$. Radio frequency - microwave double resonance techniques confirmed both the R and Q-branch assignments.