1. For a review of low-energy electron scattering in gases, see H. S. W. Massey and E. H. S. Burhop,Electronic and Ionic Impact Phenomena, Vol. I (Clarendon, Oxford, 1969);
2. H. S. W. Massey,Electronic and Ionic Impact Phenomena, Vol. II (Clarendon, Oxford, 1969);
3. L. G. Christophorou,Atomic and Molecular Radiation Physics(Wiley-Interscience, New York, 1971);
4. H. S. W. Massey,Negative Ions(Cambridge University, London, 1976).
5. Vacuum ultra-violet and electron energy loss spectroscopy of gaseous and solid organic compounds