1. Y. T. Lee: Science 236, 793 (1987)
2. W. R. Gentry: Atomic and Molecular Beam Methods, ed. by G. Scoles (Oxford Univ. Press, Oxford 1988) Chap. 3, p. 54
3. J. B. Anderson, R. P. Andres, J. B. Fenn: Adv. Chem. Phys. 10, 275 (1966)
4. D. R. Miller: Atomic and Molecular Beam Methods, ed. by G. Scoles (Oxford Univ. Press, Oxford 1988) Chap. 2, p. 14
5. R. Campargue: J. Phys. Chem. 88, 275 (1984)