Electron attachment rate constants of HBr, CH3Br, and C2H5Br in N2 and Ar

The electron attachment rate constants of bromine compounds in the buffer gases of N2 and Ar (∼250 Torr) were measured as a function of E/N (or mean electron energy). The measured electron attachment rate constants of HBr, CH3Br, and C2H5Br show maximum values of 1.05×10−9, 1.08×10−11, and 9.3×10−11 cm3/s at mean electron energies of 0.55, 0.4, and 0.8 eV, respectively. The electron drift velocities for the gas mixtures of CH3Br in N2 and Ar were also measured.