Abstract
The rotational spectrum of difluoromethylene (CF 2) in its X ̃ 1A 1 ground electronic state has been observed using molecular beam–Fourier transform microwave spectroscopy. CF 2 was produced in a free jet expansion in Ar as inert carrier gas by ArF excimer laser photolysis of CF 2Cl 2, CF 2CHCl, or CF 2CHBr or by flash pyrolysis of CF 2Br 2 in the high-pressure region directly behind a pulsed molecular beam valve. Rotational transitions were observed in the frequency range from 8 to 40 GHz in the CF 2 (000) ground vibrational state and in the (100), (010), and (001) excited vibrational states. Several observed lines were split due to the hyperfine interaction between the 19 F nuclear spin and the overall rotation of the molecule. The results were used to determine the nuclear spin–rotation interaction parameters for CF 2.
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