Electron-Molecule and Electron-Atom Collision Cross Sections from a Cyclotron Resonance Study of Flame Gases

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Abstract
Low‐pressure (6–40 mm Hg) acetylene‐oxygen flames, diluted with various proportions of nitrogen and the rare gases, were investigated. The temperature range covered was 1600–2400°K. At 2200°K, the following results were obtained for the collision cross sections: undiluted, near‐stoichiometric C2H2–O2 flame gases, 40 A2; nitrogen 30 A2, decreasing with temperature; helium, 27 A2, decreasing with temperature; argon, 7 A2; neon, 5 A2; water, about 80 A2; carbon dioxide about 37 A2. These values are up to three‐fold larger than the cross sections for collisions with electrons reported for systems other than flame gases.