Electron impact ionization cross sections for chlorinated and brominated methane and CnH2n+1Cl (where n = 2, 3, 4) molecules

- Quantum mechanical approximation to find inelastic cross section from ∼10 to 5000 eV.
- Semi-empirical formalism to extract ionization fraction from inelastic cross section.
- SCOP and CSP-ic methods found to give very good comparison with existing data.
- Group additivity rule is incorporated for large targets.
- Cross section for CBr4 is reported for the first time.