The laser induced fluorescence (LIF) of gas-phase CBr2 produced by the reaction of F atom with CH2Br2 in a crossed mol. beam apparatus is reported. The LIF spectrum ranged from 585 to 664 nm and consists of 22 peaks which were assigned to ?v1'v2'0) ?X(000) (v1' = 0, 1; v2' = 0-12) transitions of CBr2. The spectral constants of n00 = 14,885 cm-1 and n1' = 460, n2' = 189 cm-1, x12' = 3.10, x22' = -0.27 cm-1 were derived from the spectra and compared with a solid matrix-isolation study. An obvious shift of 77 cm-1 from the matrix to the gas phase spectrum was found. CBr2 is the product of 2nd step reaction of F atom with CH2Br2.

Key words: METHANE P, FLUORINE, BROMIDE, BROMOHYDROCARBON, CARBENE, LASER APPLICATION, GAS PHASE REACTION, LASER INDUCED FLUORESCENCE SPECTROSCOPY