Vm. Borodin et Ak. Kazansky, CLASSICAL MECHANICS AND THE BORN THEORY OF THE COLLISIONS OF ELECTRONS AND RYDBERG ATOMS, Journal of physics. B, Atomic molecular and optical physics, 26(12), 1993, pp. 1863-1870
A purely classical method is presented for the calculation of the cros
s sections for transitions between the Rydberg atomic states n1, L1 --
> n2, L2 by electron impact. The state of the electron in the atom is
described by the microcanonical distribution function. The cross secti
ons are obtained in a quite appealing form after a very simple calcula
tion. The accuracy of the approximation appears to be reasonable.