1. L. R. Khundkar and A. H. Zewail, Annu. Rev. Phys. Chem. 41 15 (1990) and references therein.
2. G. E. Hall and P. L. Houston, Ann. Rev. Phys. Chem. 40 375 (1989) and references therein.
3. D. W. Turner, C. Baker, A. D. Baker and C. R. Brundle, Molecular Photoelectron Spectroscopy, Wiley-Interscience, London, 1970.
4. K. Siegbahn, C. Nordling, G. Johansson, J, Hedman, P. F. Hedén, K. Hamrin, U. Gelius, T. Bergmark, L. O. Werme, R. Manne and Y. Baer, ESCA Applied to Free Molecules, North-Holland, Amsterdam, 1969.
5. see for example: J. W. Rabalais, Principles of Ultraviolet Photoelectron Spectroscopy, Wiley-Interscience, New York, 1977