Sp. Goreslavski et Sv. Popruzhenko, Nonsequential double ionization: a quasiclassical analysis of the Keldysh-type transition amplitude, OPT EXPRESS, 8(7), 2001, pp. 395-400
The S-matrix amplitude of nonsequential double ionization, written down in
the Volkov state basis, has been calculated by a saddle-point method. The d
istribution in the total and relative momenta of the two emitted electrons
is given in analytical form. The result obtained is discussed in the contex
t of the recently measured differential momentum distributions in argon. (C
) 2001 Optical Society of America.