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Translational-Energy-Dependent Emission Cross Sections of Excited Hydrogen Atoms Produced in Electron-Methane, Ethane, Ethylene and Acetylene Collisions

Translational-energy dependence of emission cross sections was measured for H* (n=4) produced in collisions of methane, ethane, ethylene and acetylene with electrons through analysis of Doppler profiles of the Balmer-β line. Emission cross sections were calculated for the translational energies of 0-2, 2-4, 4-6, 6-8 and >8 eV. The translational-energy dependences of emission cross sections are similar for the four hydrocarbons. The five segments can be classified into 3 groups. The first group, 0-2 eV, is dominant at lower electron energies. The second group, 2-4 and 4-6 eV, is dominant above 40 eV. The third group, 6-8 and >8 eV, has some contribution at higher electron energies.