1. D. Brandt, Ch. Ottinger and J. Simonis, Ber. Bunsen Gesellschaft, 77, 648 (1973)
2. G.H. Bearman, H.H. Harris and J.J. Leventhal, Appl. Physics Letters, 28, 345 (1976); M. Gerard, T.R. Govers and R. Marx, Chem. Phys., in press.
3. D.W. Turner, C. Baker, A.D. Baker and C.R. Brundle, “Molecular Photoelectron Spectroscopy” ( Wiley-Inter science, London, 1970 ).
4. See for example “Electron Spectroscopy: Theory, Techniques and Applications” eds. C.R. Brundle and A.D. Baker (Academic Press 1977) and references therein.
5. G. Bieri, F. Burger, E. Heilbronner and J.P. Maier, Helv. Chim. Acta, 60, 2213 (1977).