UV laser photochemistry of CF2Br2

Abstract

CF2Br2 has been irradiated at room temperature with KrF (248.4 nm) and ArF (193.3 nm) lasers. The fluorescence produced by the KrF laser irradiation appears to consist of only two ν2 progressions, v′2=6 and 5 for the CF2 (1B1−X 1A1) transition. The collision-free lifetime of the CF2 emission was found to be 59 ns. The fluence dependence of the emission is quadratic. Upon irradiation of CF2Br2 with an ArF laser various emitting species were noted. Emission from CF(A 2Σ+–X 2Π), CF(B 2Δ–X 2Π), CF2(2B1–X 1A1), and Br2(3Πo+u–1Σ+ g) molecules was noted. Laser-induced fluorescence excitation spectra confirmed the presence of CF2. The ArF laser fluence dependence of CF2(X 1A1) formation was found to be 1.0.