Microwave spectra of fluoroformyloxyl and fluorosulfate radicals

Rotational spectra of fluoroformyloxyl (FCO 2 ldr) and fluorosulfate (FSO 3 ldr) molecular free radicals were measured in millimetre wave region and analyzed in detail using matrix elements of rotational, centrifugal distortion, fine and hyperfine effective Hamiltonian terms. The microwave spectra of the FSO 3 ldr free radical were observed, identified and analyzed for the first time.